Sorry only just seen this.
Thanks for the offer much appreciated
I'd forgotten my Bosch warrant was two years. Thought I'd better get it done with them in that case, but still expected I would have to pay because I though they would regard a stuck and probably blocked filter as my fault.
However they say there will be no charge.
Only downside is that they can't come until next Monday 21st.
Couple of launderette trips this week then.
Thats the machine sorted.
Now when can you fix my knees...........!