Gaps in potato bed

I think I have a few seed potatoes which have rotted in the cold and wet and so I have occassional gaps in my potato bed.

I could use up some seed potatoes which the allotment shed still have and have them come up later, but I also thought I could sow or plant a dozen or so peas and have them climb up a wigwam of stakes.

That way, if the gaps are just due to those seed potatoes being slower than the rest, I won't have a clash of seed potatoes growing in the same spot and the peas might actually grow through the potato canopy and give a double crop if they are tall enough in time.

Are there any other plants I could consider filling the gaps with?

Good point - I'll go scrattin' as soon as I can. thanks