I’m a Brit. The weather won’t be that bad, is likely to just be windy and rainy (our standard). But may also be either freezing cold or like a spring day! Our weather changes A LOT. We had 50mph winds yesterday with rain and still, sunny day today.

Main tips - get an Oyster card for London public transport. Public transport is excellent but crowded. Buses are cheaper than the tube but can be hard to navigate. Boris bikes are everywhere in the centre. London is BIG and sprawling - some places are walkable, others not so much. Go to the British Museum and the Tate Modern. Enjoy the parks - Regent, Hyde and Richmond are all lovely. Touristy places (tower of London etc) are good but expensive. You can get discounts with packages - eg the dungeons, Tower of London, madam tussauds all rolled into one. You only need to tip 10% and that’s only if it’s good service - our wait staff get paid proper wages. The South Bank has a great vibe - Borough Market for food, bars all along, down into Southwark is fantastic, very chilled out and interesting.

Consider a day trip by train to Brighton (or an overnight stay, lots of nice places) LGBTQ central, loads of things to see and do, good clubs.