Rear wiper spray

Ok, got my mot coming up soon and my rear spray nozzle doesnt wanna spray. Front are working fine, reservoir full and i can hear a clicking nouse from the rear when i engage spray on the stalk but nothing! Wiper works as normal, poked nozzle with a pin but no joy! ..
 
Took the nozzle apart, cleaned it, checked the pipe and i sucked water out, so am thinking its the pump ? But if it was the pump shouldn't the front sprays not work also "which they do" ...​
 
I can hear a clicking sound when i engage the rear pump so am thinking it has power. Is it hard to replace the pump ? Ive done brakes n pads before and have a good tool set so am not a total noob, but ive heard the reservoir can be a nightmare to get to
 
sometimes 2 pumps, and sometimes 1 reversible one :)

looks like a one pump here

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Just came from the parking 15 min ago to test if my pump does not work, of it's electrical (lots of sh*t around, though) and i'm lucky, is electrical, 2 terminal, clack clack, shrink tube, aaand it's done!
 
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