It might be an idea dinning at claridges, then hitting the westend bars and stay at another hotel which is just as classy but a bit cheaper.

Food plus room at claridges is going to be fooking exspensive believe me.

Just to give you a idea of prices my meal for 2 was £206

I used this site when i was planning my night.
http://www.viewlondon.co.uk/search-pub.aspx

You can search for hotels, pubs, clubs, restaurants and you can type in a area or tube station and it shows you all the bars, restaurants etc within walking distance.

My advice to you is plan it all out where your going before hand and have back up bars incase things go wrong

Good luck mate