Saturday 16 January 2010 4.31pm
Bramah used to do them, but I think it's closed now, isn't it?
I've had one from a poundstore before (not in SE1, unfortunately). I'd call them infusers, or "tea eggs" (which might just be my personal name for the ones like an egg on a chain, so possibly best ignore that.)
Mrs I bought one recently. I'll try to remember to ask where from.
(You could use a tea pot and strainer at a push, but I know it's not as convenient for a one-cup brew)
...if you press it, they will come.