You might also like to visit (if it's still there) The Cartoonist Pub, in Shoe Lane, just off Fleet Street. It's been may years since I was there but back then it was an Olde Fashioned pub with two bars in which every spare inch of wall was covered with original cartoon art. Predominant british artists of course but they had some original "Garth" strips by Frank Bellamy (a hero of mine)

One of my highlights in the two days after Baltimore Bouchercon was visiting Geppi's Cartoon Museum - with mucho original artwork and rare
comics.

On your other topic, why does everyone insist on slipping sliced tomato into stuff? I can't stand the horrid, slimy stuff and waste much time extracting it from samdwiches and baps.