Thanks for all the advice so far.
The set up of this drain is as follows
At back of house on the corner is the downpipe from the gutter that leads into a drain and then bends away under the mono block.
About 3 metres away, down the side of the house and in line with the first drain, and in a sloping downwards gradient is drain number 2. This is where the washing machine and dishwasher only run into.
Then about another 5 metres down the sloping driveway is drain 3, but this is set about 2 metres out from the house and this is where drain one and two should lead to but nothing is getting there. This is the drain which is about 3-4 feet deep vertically and you can see the access from drain 1&2 about a foot or so down at right angles.
Thus I think that the pipe from drain one and from drain two come out at right angles from the house until level with drain 3 and then runs straight down into drain 3.
Drain 1 and drain 2 is blocked which makes me think the blockage is after the point where drain 1 and 2 meet.
I was able to put a garden hose in drain 2 and feed it in quite a distance and then syphon the water out. It slowly filled up again which I subseqently realised was the water from drain 1 obviously flowing through.
The drain cleaner I used was this
www.diy.com/nav/fix/plumbing/plumbing-supplies/waste___overflows/-specificproducttype-power_cleaners/One-Shot-Drain-Cleaner-ONESHOT-9271678?skuId=9281378
My dad also had a drain cleaning flex hose to attach to pressure washer but unfortunately none of the fittings it came with would connect to my Lidl "K'Archer" lookalike pressure washer.
Maybe could try one of these if the rods don't work
www.diy.com/nav/garden/garden-tools-equipment/garden-power-tools/pressure-washers-sprayers/pressure_washer_accessories/Expand-it-Drain-cleaning-tool-10787612?skuId=11278320 but I suppose there will come a time that it would be cheaper to phone a man!!
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