In reply to John Kelly:
"A band of rain, sleet and snow will move south across northern and eastern Scotland later on Friday, then into the Borders and parts of northeast England on Friday night. 1-4 cm is likely at some lower levels (this less likely near exposed coasts and in northeast England) but with 5-10 cm above 150 m. Drifting is also possible in the strong to gale force north or northwesterly winds; indeed severe gales with gusts to 60 mph could bring a short period of blizzard conditions to the highest routes."
Never heard a better forecast for slogging up to Gimmer or White Gyll after that!