Thanks.
Progress has been made.
1. Had to resort to banging a chisel into the plastic bush in order to have some grip to twist it out. It worked fine, though risky strategy in case you damage the thread etc.
2. Attached pedal to crank arm and gave it a couple of knocks with a rubber mallet. That freed it.
The needle bearing on the originially stiff pedal are shagged and it won’t come out. It has semi disintegrated in my attempts to remove it (including some screwdriver shaped indents in the kitchen tabl). Got someone to ask the workshop for a favour. Fingers crossed otherwise I will probably have to write it off!