Took my car into Performance 3000 in Yeovil this morning to get the fueling sorted and just a general tune up.
However, When they drove it into the garage all the coolant exploded everywhere! Turns out most/all of the rubber hoses have completly perished (which explains my constant air locks).
So I've ordered a full set of silicone hoses for the rad and coolant. That means I'm now going to have to wait till Tuesday to get it sorted.
Oh well it must have needed doing.