London

Prioritise Tower of London & Crown Jewels, British Museum, Westminster Abbey & the Houses of Parliament, Tate Modern & the South Bank and The National Gallery, Trafalgar Square. What you can skip without regret: the restaurants with photo menus and touts on the main square, any hop-on bus if the centre is walkable, and paid "panoramic" viewpoints when a free one gives the same picture. London is inland, so plan around heritage, food and landscape rather than beaches.

Stay inside or immediately beside the historic centre of London: you walk to the main sights, restaurants stay open late nearby, and you avoid paying for taxis twice a day. Pick the edge of the old town if you want quiet at night, and check the room faces a courtyard rather than a bar street.

Use the scheduled airport bus or regional train for the cheapest transfer into London, an official taxi from the marked rank when you arrive late or with luggage, and ignore anyone offering a private transfer inside the terminal. In Spain, single tickets are poor value: buy a multi-journey card (T-casual style) or a 24/48 h tourist pass only if you plan more than four rides a day

2 full days is the honest answer for London: one for the centre on foot, one for its museums and food, and one for a trip into United Kingdom. Two days works if you only want the highlights; a fourth day is worth it if you want a slow morning and a longer excursion.

Budget €90–140 per person per day mid-range: €25–40 food, €10–15 local transport, €15–30 attractions, the rest on the room. Accommodation moves the total most: shoulder season in London can be half the July price for the same room. Payment runs on the euro (cards accepted almost everywhere, small cash for markets).

Day 1 — the historic core of London on foot, clockwise from the main square, with lunch where you end up rather than walking back. Day 2 — the single biggest sight first thing, then the market and the residential streets around it, and a viewpoint at sunset. Day 3 — one excursion into United Kingdom booked in advance, back for a late dinner. Group everything by walking distance and never cross London twice in a day.

Anything with timed entry or a small group sells out first: the flagship monument or museum of London, guided tours with fewer than fifteen places, boat and wine experiences in summer, and dinner at well-reviewed restaurants on Friday and Saturday. Book those two to four weeks ahead in high season; everything else can wait until you arrive.

The classics are the same everywhere: unmetered taxis quoting a flat fare, "free" bracelets or flowers, distraction pickpocketing on crowded transport and at photo spots, card machines handed over pre-set to a higher amount or to your home currency, and restaurants without printed prices. Check the meter, always pay in euros, and keep your bag in front of you in queues.

In Spain, tipping is optional and modest — round up or leave 5–10% for a good sit-down meal; nobody expects it in bars. Lunch runs 13:30–15:30 and dinner rarely starts before 20:30; kitchens close around 23:00 and many restaurants shut on Sunday evening and Monday. Cover shoulders and knees inside churches, greet staff before ordering, keep your voice down in residential streets at night, and expect shops in smaller towns around London to close in the early afternoon.

Install Google Maps or Citymapper, Renfe Cercanías or the local transport app, Cabify or FreeNow for taxis, Glovo for delivery, El Tiempo (AEMET) for weather. Download an offline map of London before you land, and add your transport card or pass to your phone wallet if the local operator supports it.

Walk two or three streets off the main square or monument in London and look for a short handwritten menu, a full room of local voices, and prices displayed at the door. A daily menu chalked up at lunchtime is the strongest signal; a laminated menu in five languages with a host outside is the strongest warning.

Eat what United Kingdom grows and lands: the signature rice, stew or grill of the region, whatever the market is selling that week, and the local wine or vermouth by the glass. The most honest versions are in the family-run place near the market of London, at lunch, when the daily menu is on.

Lunch runs 13:30–15:30 and dinner rarely starts before 20:30; kitchens close around 23:00 and many restaurants shut on Sunday evening and Monday. Book dinner for anything popular, ask for the bill (it won't arrive unprompted), and split payment is usually fine by card. Tipping is optional and modest — round up or leave 5–10% for a good sit-down meal; nobody expects it in bars.

Do a single loop of the historic centre of London, stop at its one defining sight, then eat where locals eat near the market. That gives you the character of the place in three or four hours without a ticket queue eating the whole visit.

Free: the highest point of the old town, the bell tower terrace when it's open, and the bridge or promenade that looks back at London's skyline. Paid: a rooftop bar or tower ticket — worth it only if you arrive forty minutes before sunset to get the rail. Inland, the ridge or castle road above town gives the widest light.

single tickets are poor value: buy a multi-journey card (T-casual style) or a 24/48 h tourist pass only if you plan more than four rides a day If your 2-day plan is mostly on foot in London with one excursion, buy singles or a multi-journey card and skip the tourist pass; if you're crossing the city several times a day or using it with museum entry included, a 48 h pass pays for itself.

London is safe by European standards; the real risks are opportunistic. Avoid empty industrial or station peripheries after midnight, unlit parks, and packed nightlife streets where phones disappear. Walk lit main streets, use a licensed taxi or ride-hailing app late at night, and share your route if you're travelling solo.

Buy something made nearby: olive oil from a local mill, tinned seafood, a ceramic piece from a village workshop, wine from the nearest DO — not fridge magnets. The weekly market in London and a workshop with the maker on site beat any airport shop, and you're supporting the local trade rather than an importer.

Keep two indoor blocks in reserve: the main museum or cathedral of London, a market hall with food stalls, a long lunch, or a thermal bath or wine cellar in United Kingdom. In extreme heat, invert the day — sights before 11:00, indoors from 14:00 to 18:00, and the evening back outside.

Locals go where there's no ticket desk: the residential lanes just outside the walls of London early in the morning, the neighbourhood bar with four tables and one dish, the cemetery or convent garden that nobody photographs, and the hill road out of town at dusk. Ask the person serving you coffee where they eat on Sunday — in United Kingdom that question opens more doors than any list.