Model Technics of Southend-on-Sea, England are a well-established company with a solid reputation which specializes in model engine fuels and related products. In 1994 they entered the glow-plug market with their Firepower and (later) MaxiFlash ranges, subsequently adding their QuickFire and QuickSpeed plugs for pull-start engines as well as a four-stroke plug. Their plugs cover a very wide spectrum of heat ranges to suit any purpose. 

Although based in the UK, Model Technics have a sales email address through which overseas customers can order their plugs, etc. Check out the company's website for a complete list of their products and services.