Always use wylex on SPN boards and small TPN DB's, find them pretty good. The only thing that gets me which seems to be sorted now, was they multitude of slightly different MCBs they made, made them look untidy and covers hard to fit. However fitted one the other day and the breakers seemed to be excellent and very well designed!
Never used MK, but have just bought one to use for myself, the only reason being I got everything very cheap on ebay!