I've investigated UK minis singles and I've found the following.
Tritex (http://www.tritex-games.co.uk) have a large stock, reasonably priced, and visit lots of conventions. I've bought from them and they're very friendly.
Wickeddice (http://www.wickeddice.co.uk) have a fair amount of older stock, interestingly, and are fairly cheap. I've bought from them but they're being a little slow to send me the stuff.
Adventures Gate (http://www.adventuresgate.co.uk) have some fairly cheap stuff but don't seem to have very much stock at all.
There are some retailers who have eBay shops, but if anything these tend to be a little more expensive. Well worth looking at if you're looking for something specific.
Those are the ones I know about in the UK.
Tritex (http://www.tritex-games.co.uk) have a large stock, reasonably priced, and visit lots of conventions. I've bought from them and they're very friendly.
Wickeddice (http://www.wickeddice.co.uk) have a fair amount of older stock, interestingly, and are fairly cheap. I've bought from them but they're being a little slow to send me the stuff.
Adventures Gate (http://www.adventuresgate.co.uk) have some fairly cheap stuff but don't seem to have very much stock at all.
There are some retailers who have eBay shops, but if anything these tend to be a little more expensive. Well worth looking at if you're looking for something specific.
Those are the ones I know about in the UK.