Silly me !!
I mis-read the original post as looking for the filter, when it reads filler.
( Note to self - get new reading glasses )
....................you and me alike.
Thanks milkyman, I wouldn't - couldn't do that, I would rather pay the experts.
This is my wife's car, 29000 on the clock. Moved it yesterday and saw a red (i) and a yellow spanner on the warning panel. Nothing about the spanner in the book. Message showing transmission fault.
Called Ford dealer where we bought it from and they have booked it in for a service.
Thanks for your help, I expect I will be here again.