Those brakes are I.K.E., fitted on mid-range Halfords MTBs (I had a set on a 2005 GT). They're excellent and very lightweight compared even to high-end Shimano - I think I weighed mine at about 155g per pair. I still have them long after most of the rest of the bike went...
The levers are Avid FR5, also solid good value for money levers.