Battlefront - A NZ Company making predominantly 15mm resin vehicles and metal figures. Their site is the best site for modelling WW2 on the net. Updated weekly with advice, tips and new releases. Surprisingly quick service to UK considering they are in NZ.
Resistant Roosters - Large 15mm figures. Ranges include Soviet Naval, US in greatcoats, late war German Paratroopers and Panzergreandiers, Japanese and Finns. Site also includes useful tutorials.
Kerr and King - Provide high quality scenic items such as a tram barricade and ready made and scuplted bases for WW2
DTS Models - Glasgow based stockist for Battlefront
Stafford Games - Stafford based stockist of Battlefront minis and Wings of War Miniatures.
Skytrex Ltd - A good range of 15mm vehicles and figures for WW2. 1/144th Scale WW1 planes too.
Peter Pig - Excellent range of 15mm WW2 figures, vehicles and buildings. One of myy personal favourite manufacturers. Run by one of the hobby's nice blokes Martin Goddard. Also many figures in their extensive WW1/Spanish Civil War and Russian Civil War ranges will also suffice. Many unusual figures and vehicles in the collection.
True North Miniatures - Manufacturer specialising in 15mm Rumanian, Hungarian, Dutch, Belgian and Polish figures.
Biggles.Info - Anyone interested in WW1 aerial HAS to read some of Capt W.E. Johns books starring his hero Bigglesworth (aka Biggles). Whilst fictional, they are great for flavour of the period as many of the stories were based on true events. The main 'Biggles' books concerning WW1 in Western Europe are 'Biggles Learns to Fly', 'Biggles in France', 'The Camels are Coming!', 'Biggles of the Camel Squadron' and 'The Rescue Flight'. Thoroughly recommended.
Fantasy Flight Games - Wings of War - Really nice 1/144th scale pre-painted WW1 aircraft. Ideal for lazy sods like me. However these have no pilots. John at Reviresco however, will provide some. He Also does a large range of 1/144th scale aircaft.