Friday 16 November 2007 1.35pm
There are plenty of places just over the river from SE1 if that suits you for location.
For a smaller affair I can recommend Trinity House, which we used for part of our wedding. It is just near the Tower: http://www.trinityhouse.co.uk/events_and_leisure/corporate_events/the_house_and_its_location.html
Or for bigger ones the livery halls are really nice, like the apothecaries as Kara suggests, or I've been to Skinners Hall for a function, which was good: http://www.skinnershall.co.uk/the-hall/the-hall.htm
I think most of them will let you bring your own caterers.