The new iron has clear instructions NOT to rest on metal - so for a few weeks, I have had a towel wrapped round the Iron Rest in case I forgot. Today Bob removed the Rest, and I recovered the board with a remnant of pretty Sanderson fabric which was lurking in the loft. I turned the old cover over, to get the padding, and sewed a channel which I threaded with a drawstring tape.
So splendid new looking board - at no cost. All I need to do now is finish the ironing!