Thanks for the responses and ideas to my pressure / cooling issues in the rear engine compartment.
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Gave the manometer idea a go. Mounted one end on the dash and the other end in the rear engine compartment, by the clutch end of the rocker cover.
Couple of obviouse issues, level changed with the level of the car, and also as the speed / momentum of the car changed.
Found a quiet section of road and did a few repeat runs at low speed and then 90 kph.
The boot is held open about 40mm, and there is a large cutout behind the number plate flap.
Confirmed the compartment is pressurising at speed, fluid moves about 10mm on the gauge, so 20mm of water pressure. This is subjective due to the above issues, but there was a consistent theame.
Did a few more runs with the boot lid removed.
Still gets pressure in there but no where near as much, and engine temp appears to be slightly less.
Now to modify the boot lid and hold it open about 200mm. Test again and then maybe larger vents in the lower section of the boot lid.