Some of us non-fellow-feelers also go to pubs where (unless I'm missing something) sexuality isn't an issue. There's a great range of places to go in SE1, and IMHO it might be a shame to restrict yourself to gay pubs. [But it's none of my business really, is it.]
Oh come on Ivanhoe, you're slipping - no mention of "The Fort"? lol.
Seriously though, most of the people/pubs/wine bars in SE1 are very Metrosexual, so unless you're looking for somewhere specifically to meet potential dates, most of the places around here are pretty good fun. Just read the earlier threads about good pubs/restaurants in SE1. (& don't forget to tell the patron where you read about them).
NB I absolutely have a connection with the SE1 forum & love it!
the Gladstone is definitely the best option in SE1 - gay but not at all cruisey.
Other places not too far outside SE1 that may be worth a look - the Joiners Arms on Hackney Road and South Central on Kennington Road or the Vauxhall Tavern in Vauxhall (I'm told Duckie on Saturdays at the VT is still an absolute riot - although I haven't been for a couple of years).