Brickish.org – Brickish was founded in 2002 and is the only UK-wide community of Adult Fans of LEGO® (AFOLs). They are a lively, friendly community of fans from across the whole of the UK, and their members are interested in all aspects of LEGO® – from its history and collecting, to building and displaying.
As a fellow member I wholeheartedly recommend visiting and joining if you are an AFOL. They organise shows, have an active online community and have more and more local area meets organised by fellow members.
www.bricklink.com – BrickLink is the leading marketplace for genuine LEGO products and contains an extensive catalog of every LEGO element and set you can think of. You can purchase individual pieces, right through to complete sets. This is the place to buy all your missing pieces, spare parts and full inventory pieces for a large build.