I’ve lots of experience with 4 season walking boots and having tried about 10 different pairs I always come back to Scarpa SL M3’s. f you try you can get them for £100. They aren’t Gore-Tex, thank the gods… much better to have proper leather IMO. These Scarpa’s have impregnated leather, impregnated with waterproof stuff, under pressure. Very waterproof and warm.
To compare I’ve also used Asolo, Brasher, Karrimor, Berghaus and a few others not worth noting but all in or around £100.
I’d recommend that you try them on before you commit though, any boot, that is. Have fun.