Fair enough, Welshpug, i must be really picky when i buy cars. And tbf at £250 that is exactly the kind of list of parts i would expect to replace, i'll retract my original statement. 
Ok Matt, so these parts, are you fitting quality, new parts, or cheap/second hand parts? In my experience it's a case of you buy cheap, you pay twice.
If your exhaust has plenty of clearance to the subframe it is pretty unlikely to be causing a noise at idle, could be fouling somewhere else, but seems unlikely if all they've done is the alternator. Tbh i'd be inclined to take it back to them and get them to have a look - if it's an issue that appeared directly after the work they did they'll probably be able to find it a lot quicker than you because they'll know exactly what they moved.
Meh deliberately buying a cheap car to rebuild from the ground up is very different to replacing that many parts on a car bought as a reliable daily. Tbh rebuilding a cheap car is the best way to go imo, at least then you know exactly what you're dealing with and you can abuse it safe in the knowledge that everything is 100%.
Ok Matt, so these parts, are you fitting quality, new parts, or cheap/second hand parts? In my experience it's a case of you buy cheap, you pay twice.
If your exhaust has plenty of clearance to the subframe it is pretty unlikely to be causing a noise at idle, could be fouling somewhere else, but seems unlikely if all they've done is the alternator. Tbh i'd be inclined to take it back to them and get them to have a look - if it's an issue that appeared directly after the work they did they'll probably be able to find it a lot quicker than you because they'll know exactly what they moved.
Meh deliberately buying a cheap car to rebuild from the ground up is very different to replacing that many parts on a car bought as a reliable daily. Tbh rebuilding a cheap car is the best way to go imo, at least then you know exactly what you're dealing with and you can abuse it safe in the knowledge that everything is 100%.