Hello! We are planning on London July 4-8. I just found out our flight changed, so now we are arriving at 7:30 AM! One the one hand, it's good, because we have more time in London; on the other hand, that first day will be hard. So, here are two ideas I have to survive the first day. We are staying fairly close to the British Museum and British Library. It's a 10-15 minute walk to Russell Station, Euston, and St Pancras.)
Arrive at hotel and see if they will hold our luggage for us. Then maybe just walk around the area, check out the British library, have lunch, then go to Euston station to take a train up to the Harry Potter studio and do a tour mid-afternoon (maybe 2 or 3; if we do this, I'll get tickets ahead of time). Be there for about 3 hours, then come back, eat dinner and hang out in our hotel room, go to bed early... but not too early :)
Arrive to hotel and see if they will hold our luggage; take the train to get the London Pass (we already bought it, but we need to get the cards). Take the Westminster walking tour in Rick Steve's 2018 London book. Maybe just spend the rest of the day hanging around before going back to the hotel for an early night.
Any advice would be appreciated- I am just really nervous about the jet lag. Our plane leaves at 2:00 pm, so we are really not going to want to sleep on the plane (our original flight was leaving at 8 and arriving at 1... much better schedule).