There isn't a Hilton just called London Hilton, however there are several Hilton hotels in London (18 at the time of going to press)
I've only stayed in one Hilton in London and that was The Waldorf Hilton which is in Aldwych. For those of you not familiar with London, Aldwych is a 5 minute walk from Covent Garden Underground so its a great location if you are wanting to see a theatre show...
I first went in October 2008 for my mothers 65th birthday and we were bitterly disappointed by the rooms as my mum had upgraded but the slippers provided were very small and the bathroom floors were really slippery when wet (maybe this is where Jon Bon Jovi got his idea for his album from?!). The breakfast served on one of the mornings was cold so we sent it back aswell.
However I did complain on my feedback card and was offered a free upgrade and dinner for one night on our next stay at a discounted price.... needless to say I took them up on this offer in August 2009 and it was a fabulous weekend and we were well looked after and I got 2 nights B&B and one nights dinner for £179.00 for 2 people which I thought was excellent value for money.... the drinks in the bar are very expensive though but you do have a certain expectation when visiting the 'Big Smoke' that everything is inflated!
But I digress from Hiltons in general, so I guess what I'm trying to say is that the best thing about the Hilton is that they are regarded as a top notch hotel chain and from my experience with London, they are very keen to ensure this reputation intact..
Hilton also offer a loyalty scheme called Hilton Honors where each time you stay at a Hilton you get points and if you get enough points you can qualify for a free nights stay at one of their hotels... However it can take a while to get the points built up unless you book with Hilton on a regular basis but its free to join so what do you have to lose?
One other thing to look out for with Hilton is that they also offer discounts online for booking in advance and in January 2010 they were offering 50% their prices for quite a few selected hotels. I managed to get a hotel for £55.00 per night with breakfast which is cheaper than a Premier Inn (on their standard tariff) so its worth signing up to their newsletter...