planting in between potatoes

IMO no 

I saw month don Do this on gardeners world but thought it was a little odd given how long it takes a good lettuce heart to grow. Try radishes instead.

I think Monty was trying to grow rocket and last Fridays episode he said the rain had washed the seeds away so it did not work anyway.

do you think french breakfast radishes might be worth a try?

I put mixed lettuce inbetween my 'tatoes last year, both on top and in the trenches, with good gaps inbetween. They'd been started of in a tray so were a reasonable size when they went out. Picked leaves hither and thither off the top. When it came to earthing up took soil from between the lettuces. Had fantastic lettuces that went on for ages and looked really pretty (or attractive if you prefer  ) in contrast to the dark tato leaves. Good tato crop too 

Wouldn't try seeds as too iffy where I am.
M