Well, I finally sorted my car out. The problem was indeed the starter motor. Apparently, if you put the car away wet or damp and leave it for any length of time, then the starters have a habit of dieing.
I followed the advice and installed a mini-high torque starter motor. The replacement has the added benefit that you can now change starter motors without the pain of removing the engine or engine mount.
I took a couple of photos to illustrate how you remove the OEM starter with the engine in situ (involves removing the right hand engine mounting). So, if anyone needs to repeat the same exercise I can show you how.
All the best and thanks to everyone for their suggestions and responses.
Rick P.
