followed by Broad beans

I suspect you would have had more potatoes if you left them longer.

Don't know why you were growing broad beans in a greenhouse, you must have a big greenhouse

I'd have expected more from the spuds - what variety are they? Having said that, my experience with potatoes is that  they don't do well under cover. All top and no tubers.

I've got some braod beans in the polytunnel John, and some runner beans, and peas, because I'm running out of room outside!!!!

Yeah but you like showing off

There were about 6 potatoes to each tub they were in the greenhouse in light but some shade from the bench, cant remember what make they are

I saw a friend's spuds recently - he grows his like this every year and they are very successful:
4 growbags. cut a hole like you would if you were going to plant tomatoes. then plant 3 spuds per bag. Plant them in January/February. Keep then in the poly or greenhouse - basically out of the frost.  (he keeps them on his staging, save him bending) and let them grow away. Then at the middle/end of May feel around and see how big the spuds are. Harvest those that are big enough and leave the rest. Move on up the bags in this way taking out what you need. By the time you get to the last bag, the first bag will have grown some more, ready for you to harvest. The beauty of this is that they don't get slugged and they don't get scab. I'll get her to get a picture to post up here.
Night night
Oliver - its very nice on my shed roof especially watching all the new plot holders working away!