Common fuse blowing..(public service announcement) - Westpig
I don't know whether or not i'm teaching people to suck eggs here...but...

The modern Astras have the same fuse for the washers and the boot opening.... and if the washer jets freeze, you try to use them and they can't/won't work, they'll easily blow the fuse..which will mean they obviously won't work, but unless your stopped and can here the washer motor isn't working, you wouldn't know that because you'd think it was the ice blocking it...and when you get to your destination you won't be able to open the boot either.

Then, unless you have a screwdriver handy, you can't access the under bonnet fuse box to borrow a fuse from elsewhere just to get the boot open.

So...in this cold weather, work out which fuse it is, get a spare and keep a screwdriver in the glovebox, not the boot. Not sure if it's the same with other Vauxhalls.
Common fuse blowing..(public service announcement) - davidh
Certainly on the Astra H 2004-2009 this occurs.

Its fuse number 7.

I've heard that it can be safely uprated to 15A to stop this occurrance but dont quote me on that.
Common fuse blowing..(public service announcement) - piston power
What a daft car and i have one.!