Fan belt snapped again!

Tonight my Phone rang ....only happens when there is a problem .
My daughter was sat at the side of the road with steam coming from the bonnet and the battery light on! There was a pop noise ...a bit like a cork blowing off. I suggested this was the expansion bottle lid hitting the bonnet ...which it was ...and yes the fan belt has disappeared ...AGAIN.
Anyway she was only 5 miles from home , so waited for a while added water and limped home. 54 plate Jimny by the way so M16 engine?
The same thing happened a few months ago.....
The fanbelt ...or something squeaks on damp days on start up, but is correctly tensioned and was checked by the garage last week when a new clutch was fitted.
I have read on here about flanges breaking up on the crank pulley , I suspect this to be the issue as the 2 belts on it will try to run against each other under load straining one..
How easy is it to attain a new pulley
Is it fianacially feasible for a young lady groom to employ a garage mechanic to do?
Is there any one in the high Wycombe area who is able or recommended to help a damsel in distress again.
I'm in Manchester so can only diagnose over the phone for now......but a gap where the belt was in self explanatory


On a foot note as a father it is nice to know that while she was sat in the bus stop with the bonnet up , a chap stopped to see if he could help, she had it in hand but Eitherway Chivalry lives.

Cheers, no air con ...so a bit easier.....she contacted the garage who checked th fan belt last week when they did clutch....
Just waiting for her to get back to me for results .....Bank holiday plans for us on hold .....that said her local pub does good grub and ales!

Ok so she is mobile again.
She drove it to princes Risbourgh, to the local garage , where they checked the pulley and found it fine, however the water pump was not at its best with regards to probably not working!
So fitted new one along with belt and labour £179...
To be honest £80 for pump , £25 for belt £70odd in labour seems fair enough.

I'd hope that was genuine Suzuki parts.

I got two Conti drive belts (PAS/Aircon and Alternator) and water pump for £52.99 from my local Eurocarparts.

I know what you mean ,As far as I know they came from the local Suzuki dealer.....however even if they are from the garages supplier , he did the job very quickly and saved me a tank of petrol there and back, a day searching for parts ....priceless!!!