Similar to mine ...
https://the75andztclub.co.uk/forum/s...=286990&page=3 - in my case the actual pump was fine but some bayonet connectors had worked themselves loose. Later talked to an ex-Rover mechanic who reckoned he's seen it before when the filters (early type) became clogged-up. Never did anything to the filter and the car is still in almost daily use.
Regards