Bingo!
Took a break and started to think about putting a header tank at the rear of the engine off one of the heater pipes.
Quick Google led me direct to the following advice from davecymru circa 2012 - 'Just beware of air locks. Myself, Pat and a few others simply cut that pipe and fitted a header tank there. As that will also assist if/when you drop the radiator.'
That seems to be a plan.
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