There are specialist publications that research current competitions, and provide the answers, give tips and advice, and other comping news, information.

Competitor's Companion: Chartsearch, 28 Charles Square, London N1 6HT.
All-In-Won: All-In-Won, 7 Broxash Close, Bromyard, Herefordshire, HR7 4TU.
Winner's Friend: 11th Floor, Centre Point Tower, 103 New Oxford Street, London WC1A 1QQ.
Competition Grapevine: P O Box 3171, London E12 5EP

Competitors World Magazine (on request from Newsagents):

Unit 5, Ryhall road Industrial Estate, Gwash Way, Stamford, Lincs PE9 1XX.