Exactly the same thing happened to my mother-in-law's machine. Fried slug completely destroyed an area of the PCB and did unknown damage to surrounding components.
You are unlikely to get the PCB fixed and should really be thinking about a replacement washing machine.
One possibility, however is that secondhand parts are often available on EBay. I did find this:
http://www.ebay.co.uk/itm/Hotpoint-WMD962-washing-machine-main-PCB-module-board-/152387939705
Search and you should be able to find more.
Do be careful - some new PCBs are common to a number of machines but need firmware programming in, to make the unprogrammed module have the right personality to suit the machine it is to be used in.
you could, if funds are tight, check out your local British Heart Foundation charity shop - or any charity shop stocking electricals - i saw a couple of nice Bosch machines recently for less than £100 near me
XXX, February 2017