Noel
If i remember right, we have the same size shoes
i take a 10 1/2 or an 11 depending on the shoe.
My wellies are a 46 or size 11 and they are ideal. I wouldn't be going 2 sizes up.
If you go into country ways in town they have a good selection of nice boots to try on.
Ben should have quite a few in the shop as well
Definately worth trying on a few first IMHO.
Sandy