The RSGB publish a monthly contest newsletter. The current one for December 2015 is here. The newsletter contains some helpful links to the forthcoming HF and VHF contests, plus results of recent competitions. To add a personal note: In 2015, I have taken part in almost every 80m contest run by the RSGB. I have also entered most of the other HF contests run by the same organisation. The end result is that I am now (just) in the lead for the overall HF championship cup. The following link shows the details.
73 Graham G4FNL