SAS GUARDIANS LIMITED - west midlands. ....For All Your security Needs..... security. SAS GUARDIANS LIMITED is a security based company in the west midlands telford area. we supply bouncers, door supervisors, sia training sia licensed doorstaff to lesuire venure pubsa nd clubs, we also provide evnt security and man guarding to event and crowd safety venues. we provide drugs dogs as well as patrol dogs all sia approved