Can anyone give me tips where to buy a washer dryer
AO
Currys
High Street
Local independent store

AO through Quidco.
Might as well get some cashback
At a local Euronics store. They are local retailers with the buying power of large retailers.
If you are in East London, I can recommend https://www.peejay-electrical.co.uk/
Topcashback can normally give cash back on bigger purchase like this.
Last time I bought through AO via topcashback.
I recently bought a replacement oven from AO. Ended up paying a huge markup to have them install it (as I have no clue!), and then got them ringing me to flog me insurance for it afterwards. I can’t fault the item or the service, but be prepared for the possible extra cost and hassle.
Agree that you should use quidco/topcashback if you can.
I bought my washing machine from John Lewis. Avios from the BA store and extended guarantee.
Argos