TLDR: GET A DISC BRAKE
Cable: Avid BB5, ex display, no lever £31: http://www.chainreactioncycles.com/avid-bb7-mechanical-disc-brake-ex-display/rp-prod107104
Hydro: Clark Skeletal, front, left lever £25: http://www.chainreactioncycles.com/clarks-exo-skeletal-hydraulic-disc-brake/rp-prod80605 Shimano Deore M615 front, left lever £34: http://www.chainreactioncycles.com/shimano-deore-m615-disc-brake/rp-prod108802
If you don't mind second hand, I've had great results with Deore M615s off ebay on a MTB, and I know Snottyotter and Voidcore both use Shimano hydros with the pivotted lever.
@Emyr started
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TLDR: GET A DISC BRAKE
Cable:
Avid BB5, ex display, no lever £31: http://www.chainreactioncycles.com/avid-bb7-mechanical-disc-brake-ex-display/rp-prod107104
Hydro:
Clark Skeletal, front, left lever £25: http://www.chainreactioncycles.com/clarks-exo-skeletal-hydraulic-disc-brake/rp-prod80605
Shimano Deore M615 front, left lever £34: http://www.chainreactioncycles.com/shimano-deore-m615-disc-brake/rp-prod108802
If you don't mind second hand, I've had great results with Deore M615s off ebay on a MTB, and I know Snottyotter and Voidcore both use Shimano hydros with the pivotted lever.