Car's still not playing ball. After last weekend's slow trip North, ripping out all the cooling system, and coming back South with what appeared to be it all fixed, it went all Pete Tong again 
Looks like the thermoswitch isn't cutting in properly, and so the systems overheating and boiling over. Thankfully it's not as serious as a complete failure, and having purged the system, there doesn't appear to be any air trapped anywhere.
Seems okay on short journeys now, least going to and from the shops. Thankfully I've no long journeys to plan for in the near future, so will no doubt be spending a bit more time investigating next weekend 
