Yes, the range is based upon UK police officers.
The Korwin SAS are part of a 'fill the mould' deal with the guy who runs Korwin. He is currently sculpting the first releases in the 'Urban' part of the range, 4-5 different types of UK-based gangs with international overtones, plus the first two figures in the True British Heroes range. The SAS may look a little crude to some but look quite good in real life, the newer stuff being sculpted is much better.