Well, I've sorted out my own query with an extra added bonus!
I telephoned another dealer and put the question directly and politely to their service department asking whether my own 500 required any software updates. They confirmed what I had previously been told using both VIN number and Registration number, that my car does not require any critical or safety related software updates. Query resolved to my satisfaction. The bonus was, on asking how much they charge for a first service on a 1.2 POP with 5000 miles on the clock, they quoted me just under 85 quid (on the understanding that I supply my own pollen filter - (8 quid off the auction site) staggeringly less than the 149 pounds a more local dealer wants to charge. 85 pounds is what I would consider to be a perfectly reasonable charge to pay a main dealer for an oil and filter change. Ten quid more than an independent but with the added bonus of a Fiat stamp in the service log. I have gladly booked it in for that particular main dealer to carry out that service. I have since received a call from the dealer I originally put my query to, that the standard charge to hook up a car out of a service schedule to check for any non safety related software updates, is 60 pounds. Some things never change there! When my Neon lost all of its immobilser and alarm codes, the franchise dealer charged me nearly 70 quid to reinstall everything. It took them less than two minutes (I watched them) hooked up to a laptop computer to do the job. That's a pretty impressive charge rate! Anyway, my local Fiat dealer politely reminded me of the benefits of taking my car to them, well they would, wouldn't they? Sorry, but their service quote compared to the other dealer in my opinion is terribly inflated and hence the other dealer will get my business despite the fact it's over 20 miles away from where I live. Moral of this particular story is, don't be idle, get on the blower and make some calls, send some emails and don't take any clap trap from anyone.
Exactly what I've done with both my services