Useful Links

Allotment.org, the most popular allotment site in the UK
This site covers pretty much all and everything allotment related.
http://www.allotment.org.uk/

The Chileman, for those solely interested in chillies this site's chilli database is
awesome - all you need to know about chilli varieties.
http://www.thechileman.org/search.php

Premier Seeds Direct,  I've been buying seeds from these guys for years now
they stock a huge range of seeds and many hard to find heirloom varieties.
Very prompt, reliable and reasonably priced.