A good friend, Rob, helped with the heater plumbing yesterday. No issues encountered although he did adjust the lengths of pipe to enable the valve to fit snugly between the heater case and the battery.

(edit 10th Jan. I accidentally put the internal vent plate for the heater the wrong way up. The 'ears' should point downwards to direct warm air into the footwell. Thanks PeterM for commenting)

He also suggested a pipe connected to the hole in the top of the battery (see photo) apparently these batteries are unsealed an can cause unsightly marks inside the engine bay. This pipe is just cable tied down to the gear box mounting.

Today I fitted the handbrake mechanism to the chassis. There are two connection points (but one lead). Caterham tell me that the correct connection is the upper one (it is for the handbrake warning light).

I also went back and removed the headlight bracket and fitted the correct grommets (which were missing from the original pack). I thought that this might be troublesome. However, I used a trolley jack to raise each suspension arm and undo the front bolt for the upper wishbone. It wasn't as tricky as I thought.