My love for travelling - and especially London - came to me in July 1991, when I was 13 years old and went to London and Canterbury with my mother. I have a lot of loose memories from this trip, but unfortunately no pictures or a lot of details.
We stayed at Dorset Square Hotel (quite a nice one, not far from Baker Street Station), and spent most of the 3-4 days we had in London touring the must-see places: Greenwich, Tower of London, Oxford Street (Virgin Music), Piccadilly, Madame Tussaud, Harrods - and, of course, we also caught a show on one of the theaters for which London is so well-known.
The show was the Lloyd-Webber musical Joseph and the Amazing Technicolor Dreamcoat at the London Palladium starring Jason Donovan - and remember, this was back at a time when he was still somewhat famous. The show made a great impression on me - not because it was THAT great (it was okay but, compared to other LW-musicals, about average), but because the style, the music and the theatre is just - so me! And so, when I re-visited London 5 years later in November 1996, I caught 3 more shows. The London Theatre experience is really worthwhile.
Being the Sherlock Holmes fan that I am we naturally walked down Baker Street - which was quite a disappointment, but obviously you can't feel the life of the late Victorian era in present-day London.
We also paid Harrods a visit, to satisfy my taste for useless and expensive items - luckily I didn't have any money back then.
For the last days of our England stay we went to Canterbury where we stayed with some old friends of the family. Canterbury (the centre, at least) is a very beautiful city, best known for its impressive cathedral. It also has a place in Canterbury Tales (by Geoffrey Chaucer) - one of the oldest English novels, from the 14th century. We visited the cathedral and the Canterbury Tales museum, but we were disallowed in a central pub because of strange British regulations demanding than no persons below the age of 16 must enter a pub?! (or something like that)
We only were in England for a few days (5-6) but it made quite an impression on me.
(The above was written in 1998, and has only been slightly revised since then)
[News update]
I've been to London three times since then - in November 1996 (on a School (Business College) trip), in July 2003 and for two days in March 2004, on the way to Ireland - you can read about the 2004 tour at the brand new travelogue here.