The best production method for heavy boots is "Veldtschoen", where the upper leather is turned to the outside (forming a flange) and stitched, thus preventing water to penetrate through the welt. Tricker's, as well as C & J, Grenson, Alfred Sargent, Cheaney (but not EG) offer some country models in this method. But I believe the "Stow" is standard welted with a storm welt. (Difficult to see on the site, I can be wrong).
FWIW, a previous version of the EG catalogue (the oblong one with the green cover) lists the Galway boot (high cap-toe derby boot) and the Dundee (a shoe version of the Galway) as being made in the Veldtshoen manner. I don't know if they still do this, but there it is.
I'm afraid; I'm not into heavy country boots. I have just a special order with EG for a pair of "Halifax" boots. In the catalogue they are classed as country boots with rubber soles and last 505, the chunkiest of all EG lasts (but graceful and elegant when compared to the Tricker's last). But my boots will be dandified and smart town boots; they go on last 808, which is the nearest thing to a chisel toe. (They should be ready in January.)
I'm sure that they'll look great. A sort of half-boot version of the Dover, isn't it? What leather did you choose?