PCB Manufacturers

UK

Screenbond 1 and 2 layer, low tooling cost, can do 24hr if you can afford it. Stickleback They have a prototype service via their Ebay shop

PCBCart Long established Chinese supplier, with wide range of options at good prices, even after shipping costs.

Eurocircuits Wide range of services, also stainless solderpaste stencils.

PCB-Pool Pooling service, with free stainless paste stencils