London is less a single city than a set of neighborhoods loosely stitched by the Tube — worth picking a few areas rather than trying to cover it all.
A few things decide already knows about London before it even runs a live search - grounded background, not a substitute for the price checks a real itinerary still runs.
Getting around
An Oyster card or contactless payment caps daily/weekly spend automatically and is markedly cheaper than buying single paper tickets; the Underground has "zones," and traveling into or through Zone 1 during weekday peak hours costs more.
What things cost
A sit-down dinner for two with drinks in central London commonly runs £60-100; a pub lunch at £12-18 is a legitimate, non-touristy option, not just a budget fallback.
Tourist-trap watch
Restaurants immediately around Leicester Square and Covent Garden's main strip are reliably priced above their quality; a short walk into Soho's side streets or the Borough Market area tends to offer better value.
Worth knowing
Most major London museums (British Museum, National Gallery, Tate Modern) are free to enter for the permanent collection — only special/temporary exhibitions charge, which is easy to miss when budgeting.
Practical
Standing on the left, walking on the right on Underground escalators is a strongly enforced social norm — blocking the left side draws real irritation from commuters.
Dietary notes
London has one of Europe's most extensive vegetarian/vegan restaurant scenes given its size and diversity; nearly every neighborhood has dedicated options, unlike more traditional-cuisine-bound European capitals.
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