Monday 25th Feb – Depart Heathrow 13.00 – arrive Calgary 15.20.
Collect SUV – on the road by 4.20 pm. 3 hour drive from Calgary to Golden.
hence the stay in Golden which is only 2 hours from Revelstoke,
If the weather has been good, then the driving times are accurate. If there is a dump, then expect significant delays for highway avy control. I've done Calgary/Golden in 3 hours and I've done it in 9 or not at all. And Rogers Pass is not conducive to maintaining a strict timetable.
Perhaps you should consider heli-skiing out of Golden with Purcell Heli? Base yourself in Golden or Kicking Horse, day-trip or overnight to Revelstoke as your schedule/weather permits. I'd hate to see you stuck in Golden while your heli lifts off in Revy.
Word to the wise, if you're renting a car in Calgary, pay for the windshield insurance and if you can get a winter tire upgrade, then do it. No fun driving the Kicking Horse Canyon or Rogers Pass on all seasons in snow.