Further to my posting of September 2021 and the warning by Stemo to wash out the bleach or the pump will stop working.
Well I did wash out the bleach but, preparing the car for the MOT I found the screen washers had stopped working again. I cleaned the filter, not a gauze filter as I had expected, but a mesh in the end of the cone shaped rubber connector to the pump. No result. I checked the voltage to the pump when activated and it was fine. So the pump had failed as Stemo had warned, also possibly due to doing only 400 or so miles in the car in the last year. New ones are available on the net for £12 or so inc. postage but I had no time to get one before the MOT. As the headlamp washers are working I now realise I could have connected the front screen washer tube to the head lamp washer tube and blanked off the tubes to the head lamp washer and rear screen which would have covered the MOT requirement. Thank you Stemo. This website is so valuable.