UK suppliers:
Tandy (not a fan of most of their stuff)
Le Prevo (good, but mail order is a pain)
Metropolitan Leather
Abbey England (got to register to see prices but a good selection if you know what to look for)
JT Bachelor, Islington (They will mail order over the phone)
The Identity Store (never tried, nothing especially interesting to draw me there)
Whereabouts are you in Dorset? Got some mates near Ringwood, and another in Poole.