Spectrum Screenshots, loading screens, tape covers:
http://www.zxscreens.i12.com/zxscreens/

History of Ultimate:
http://www.geocities.com/SiliconValley/Heights/5874/retro.htm

Spares and supplies, etc
http://www.sintech-shop.de/home/spectrum-products.htm

Ultimate Play The Game:
http://www.ultimate-wurlde.com/games/default.shtml