I've been having charging/battery problems over past few weeks, resulting in a no start after a short drive..... normally solved by a 10 min drive after a quick push or jump start.

It's now apparent that the alternator doesnt work, hence requires changing.

Looking at the alternator and its location makes me think this is a major job as it's in a very tight area to get to.

Any help or pointers would be marvellous 

It may possibly be the battery at fault.

If the battery is completely flat and sulphated and may also have defective cells, then this will not allow the alternator to charge due to excessively low voltage being supplied to it.

It would be worthwhile trying a new battery and then taking a reading from the alternator once the engine is running with a fresh battery.