I agree Telco are horrible. Contactum was always a favourite of mine.I have always liked Schneider's Ultimate slim range. Also never had a problem with LAP and have used them quiet a few times before.
Brands I tend to avoid personally for switches and sockets are Telco, some lower end BG stuff and Contactum.
Most important thing is to not get no-name brands of places like Amazon, eBay, Allibaba, Banggood, etc... that may not comply and meet the relevant standards such as BS 1363.