Just wanted to thank everyone who helped me over the last month with my alternator and battery dilemma.
I'm happy to report that my Exide 225 6v batteries are now installed, so thanks to those who posted up guides and pics and also to those who helped in the battery discussion. Also the new 90amp alternator has been installed with a new bracket and the starter circuit checked. Sterling is in situ and the wires are ready, just need to connect it up.
It's early days but I feel a sigh of relief (did someone say cold beer?) at having hurdled these two obstacles.
Only problem is I have just found out my windlass motor is kaput, so it really is two steps forward and one step back! Hey ho, boats, eh?