The filter looks ok to me, dirty yes, but otherwise normal. If it wasn’t slipping, and you were shifting early. Adjust bands, New fluid, filter, and small incremental adjustment to the kick down linkage, drive, test, adjust, repeat making notes of where the shift point is.
Thank you for taking a look at the filter and debris, that's much appreciated; I'll carry on with cleaning and checking the valve body and report back when it's rolling.
Thank you also Lord Sparky.
