Ok this is for all you guys out there in England

My dad and I are trying to figure out how much we'd be paying for our trip to London to see the Howard Shore concert on Spet 22. Hoping it won't be too much that we won't be able to go

Thought I'd post here to see if anyone knows any good places to stay/eat while we're there and their prices or maybe a website to check out. I'm sure you guys could recommend some places to go and see while we're there. Any advice would be greatly appreciated!
Anyone got an extra room?
