Here's a picture of my Spring "designer" peas that were overwintered, taken this morning in the cold greenhouse. A foot tall and just starting their "big leaves", and if you look, the greenhouse is built on a course of 8 inch breeze blocks. No meeces are going to bother to burrow underneath that, even if they knew anything was there in the first place.
I love my luxury crop of early peas, and the same with greenhouse carrots, weeks and weeks before the maincrops. There's something about a little care and effort that makes the humble pea a delight to eat in late April. Not many are required, maybe a hundred seeds, as this crop is grown for snacking on the plot.