also worth checking, that the feed pipe to the washer jets isnt bent, where the bonnet hinge is. I has this problem, they worked when bonnet was up, but not down. The pipe got crimped, so to speak when the bonnet was closed.
There is a little clip on the underside, just use a flat bladed screwdriver to move it to one side then the jet will pop out, they are a couple of quid for new ones or you could get some from a breakers yard.
tell you summing, take the pump out all together and you will see a small black bit of rubber take that out it WILL be cloged and slow//stop water from going any where, wash the gunge off it and you will also see lot's of black gundge in the bottom of the washer bottel