Simon, it was beyond cold, it was the coldest I have been in 20 years of fly fishing, 3 layers on my legs, 5 on my chest, still freezing. The day started badly when I found I could not stand up properly in the boat because the floor had about 5mm of ice on it

From there it just got worse.
Next time I go I'm fishing, its from the bank, thats where the fish are, you get better line control, walking around gets the blood circulating and you don't get a face full of freezing water trying to move to your next point.
The few fish we caught were stuffed with Daphnia and orange or orange tinted fly's were the order of the day.
Its about a 90 minute drive for me and I was cold to the bone even after driving home with the heated seats and heater full on, in fact the food I took to eat but didn't was genuinely still colder after the drive home than the stuff in my fridge which is set at 5c
The only positive aspect to the day was my new boat partner Steve, excellent company in adverse conditions.