I went to a Hotpoint WF540 this morning, took 15 hair grips from pump filter.
This is the first one I have seen with the Indesit type pump set up, the pump is front mounted, behind facia on the right with the bog standard Indesit pump & unscrewable filter. The motor is mounted to the left of the drum looking from the front, it does mean that access the main PCB is much better.
I have been having a look on Partfinder and cannot see this set up in the WF540 list? I don’t have the commercial code to hand, perhaps that would shed some light.
Jim.