Ross: are you familiar with this site, Flory Models (formerly ProModeller)
It is a great resource though there is a big bias toward aircraft, armour is not ignored and there are some very good build videos and kit reviews including the new Accurate Armour Jackal. Lot of tips, ideas and training videos. It is a subscription site at £2.99 per month but it is worth every penny. The videos really helped me get to grips with airbrushing issues for instance. The forum part has an armour section.
http://www.florymodels.co.uk/site-news/
Also the Vallejo site has a lot of very interesting and informative stuff. It does push their products and some are specifically designed for military vehicles and figures but it is a first class resource and the products are very good.
http://www.acrylicosvallejo.com/gb/index.html