samokan, thanks for your hints, I certainly plan to go to akihabara. Also since I am there for 2 weeks I may to go other cities, like Kyoto or Osaka depending on how far away they are.
Picture2Perfect, I'm flying from Heathrow also, will be sure to take lots of pics etc. Because I am an IT contractor and I haven't had a proper holiday in years I am not doing this trip on the cheap!
I'm paying 1250 pounds for the flight (premium economy, I am 6'4 and need legroom for 12 hours!) and staying for the first week in Hotel New Otani Tokyo which is £80 a night for 4 or 5 star hotel
However if I was on a budget I could have probably flown economy class for £500-£600, and I would have stayed somewhere significantly cheaper.
http://wikitravel.org/en/Tokyo is very useful!
After my first week of "luxury" I am going to stay somewhere a little more japanese once I have more confidence with the culture. Not sure where yet, but we will see what happens!