Perhaps there's something blocking the drain pump.
This is the pump:
http://www.4whirlpool.co.uk/washing-machine/awoe-9140-859202410010/drain-pump/product.pl?pid=1886926&path=600169&refine=pump&model_ref=2613545
When you cleaned th efilter, did you check you could turn the pump impleller?
XXX
January 2017