In reply to Frank the Husky:
> Are the roadworks etc still ongoing on the A82 round LL?
See my post above.
> That gives me about 6.5 hours so it's a finely balanced decision and I am not 100% sure it can be done!
It definitely can be done although getting onto the M60 is probably going to be the biggest issue! You can make up a lot of time on the M6 and M74, but making it up on the M80 or A82 before Tarbet requires a bit more, errr, dedication.
rka's alternative route around Callander *may* help (Callander was busy enough last Tue lunchtime), although it's smaller roads.
FWIW it's worth:
Uddingston to Spean Bridge:
A82:
Distance: 124.6 miles
Time: 2 hr 55 min
(bit of town driving around Dumbarton, fast to Tarbet, slow at LL roadworks, can make up a lot of lost time at Glen Coe, never seen speed cameras there, slow around Fort William)
A9:
Distance: 147.8 miles
Time: 3 hr 12 min
(congested Perth to Pitlochry, fast Pitlochry to Dalwhinnie, can't make up much time on A86 to Spean due to road, have to be careful on A9 Stirling to Perth speed cameras (average cameras due in operation in October))