Breeding butterflies as a hobby - UK

[Mike Tough]

Some time ago (1970's) I had a hobby of breeding a wide range of butterflies
and moths. As well as locally collected specimens, I used to send away to a
UK company (Worldwide Butterflies - I think) for eggs/pupae of more exotic
species.

Since then, my involvement has lapsed, but my 8 year old son is now very
keen on pursuing the same hobby.

I am now looking for any UK companies that can supply eggs/pupae. Can
anybody suggest any companies that do this?