if you're also an angler then i'd suggest you check your nearest sundridge stockist,
i most often use a sundridge nimbus light weight suit, spot on for spring through to mildish winter days. and totally waterprooof with loads of pockets. stick sufficient thermals underneath it and it did also cope perfectly with the top of the woodhead and 4 foot of snow last winter while searching for mountain hares.

i also have one of the heavy sundridge arctic bib and brace suits, but this is far too warm in britain if you're going to be moving about much, though it would cope with sitting on the edge of a windswept resser mid winter for hours no problem.

one other thing i have tried but not yet own is the stealthwildlife olive range, which is damned good.

Thanks chaps go outdoors sounds the place. Nick I go fishing myself I have (had) a Snowbee ¾ length which I used for fly fishing and doubled up as a birding coat too. However last weekend was fly fishing the Welsh Dee for grayling. My net was attached to back of coat on the D ring but I did not notice the net had caught on barbed wire the elastic pulled to the limit and I carried on walking oblivious and ripped the back out of the jacket.

Pete, have you tried a fishing tackle shop? I do a bit of fishing and the coats that we wear have to be waterproof, warm and breathable etc to cope with all the types of weather that are thrown at us. They're usually always made in dark colours too so there's no issue of standing out like a sore thumb when you're out. Worth checking out.

Failing that, Get yourself to 'Go Outdoors'. There's one in Wigan. They have loads of different types of coats ranging from quite cheap to very expensive.