Go further north up Charing Cross Road and cross over Cambridge Circus - be careful and obey the Pelican crossings - Shaftesbury Avenue is very busy with traffic and the pavements can be very crowded, so there have been numerous pedestrian traffic accidents here over the years.
Charing Cross Road Cambridge Circus to Centre Point - map via streetmap.co.uk
On your right you will see the distinctive blue livery of Blackwell's bookshop, which is organising the "Evening with William Gibson" event, You should be able to get tickets there @ £7 (£5 concessions).
Across the Charing Cross Road from Blackwell's is the Montagu Pyke pub, which occupies most of the site of the former Marquee Club music venue (circa 1988 to 1995). The pub itself is very large inside, with (relatively) cheap drinks and food (remember that this is the West End of London), so it is a candidate for the William Gibson Board posse pub crawl.
Folyes bookshop at 113-119 Charing Cross Road
and the former US chain Borders bookshop at 120 Charing Cross Road {N.B. this closed in December 2009]
are almost on opposite sides of the Charing Cross Road from each other.
Borders is on the corner of Denmark Street, which is full of music industry related instrument shops, studios, former printed sheet music publishers etc. which gave it the nickname of Britain's "Tin Pan Alley". In the 18th and 19th centuries it was part of the notorious slum the Rookery in the parish of St. Giles church (at the far end of Denmark Street), infamously depicted by WIlliam Hogarth in his Gin Lane engraving.
As will become clearer, not that much has changed over the years !
Denmark Street is also mentioned by William Gibson in Spook Country
The Tottenham Court Road Tube Station re-development has now literally destroyed the Internet Lounge, the Astoria theatre, the Zone One Brazilian cyber café and the drug addict gathering point steps into the subway in the shadow of Centre Point