Can you hear the pump trying to drain it when you start a cycle? If not it needs a new pump.
Is there a block in the drainage pipe (blow down it and see if it bubbles in the filter compartment). Or a block in the drain - try pouring some water down in.
Otherwise, I had the same problem (an E20 but a clean filter, no blockage and working pump) and it turned out the condenser (a large plastic vessel) or the right side of the machie (you have to take the whole back off) was full of fluff. The engineer just used a wire hanger and ran it under water to clean it out.
If you've found that it hasn't been drying the clothes fully recently that could well be the problem.
GideonS
February 2006