Gents, thank you for all the replies and suggestions, it is much appreciated.
I've managed to get in to the car but I'm rather hampered as to what I can do having only one good arm following a very recent operation!
I couldn't see it at the time that I posted but I had left the passenger window partially open, just enough to be able to get something in to pull the lock knob/pin and open the door. That stopped the alarm going off which is what had alerted the neighbour and subsequently me to the problem. However upon shutting the door again, the alarm started going off and due to the battery being so low, the remote was having no effect. I enlisted the help of my taller than me but much slimmer daughter to squeeze into the car via the now openable passenger door-did I mention that the passenger is side is parked tight up to a project motorcycle and you can only open this door about 300mm?! Anyhow, she was able to release the bonnet, my idea being to some how mute the alarm siren with some rag or something. Of course, as usually happens something eklse decided to show its hand and this was to be no exception. Whilst my head and torso were under the bonnet looking at options, that the bonnet struts decided to take a dump on me and I have now been marked by my car with a nice catch shaped mark on my back
Extracting myself from the jaws of the car, I made use of the delivery tube for the replacement rear glass and bonnet struts that I had bought to fit at a later date and now have a ghetto bonnet prop! whilst writing, does anybody know where to get the correct size adaptors for the bonnet end of the replacement struts? The ones supplied and installed as Porsche 944 s2 fitment are wrong and the alternatives sent are no good either!
It was at this point that I had to leave proceedings due to visitors.
With access at least possible for no.1 daughter, I can perhaps nowt get the battery charger hooked up at some point although I do have one of the Porsche Charge O mat units that supposedly charges through the cigarette lighter socket which is a bit more accessible at this time and would stop the need for having to be a contortionist to access the battery if it works? I seem to remember reading somewhere that not all Porkers can be charged via the lighter socket but for the life of me, I cant recall where I read it or which models it mentioned.
So that is the current state of play, limited access to the car interior, bonnet open and a marked owner!
Thanks again to all who commented and made suggestions, much appreciated.