Thank you everyone who has so far commented in this topic, I've been a bit overwhelmed with the responses to my OP to make many individual replies, apologies for any I miss,
Please folks DO READ MY ORIGINAL POST BEFORE REPLYING (Yes I'm shouting), many of you have either drifted totally away from my original request for information, or have jumped in half way down, and started getting into a Windows V Mac brawl without bothering to check the real purpose of my OP,
I have No interest whatever in XP, it's old, it's outdated, it's unsupported, even Microsoft dubbed it a 'Downgrade' option when buyers of new laptops demanded it as an option to Vista, (and who wouldn't have in hindsight)!
I was using XP when it was a BETA pre release OS, and would break it for fun to learn how it worked and to fix it, thank God I did too, because the basic principles work just as well in Vista and Win7!
I was forced to move from XP in 2006 when I had to buy a laptop for use in France, and which unfortunately had Vista loaded, that was dumped PDQ for Win7 because it was a total PIA to find drivers suitable to run XP on the laptop, I still use XP on a spare machine mainly because it's so old there are no drivers for anything else, but I am Not going to use XP for my day to day online needs, Period!
I love Windows7 and wouldn't use any other OS out of the MS stable by choice, And, as it happens, my laptop also starts as soon as I open the lid, but that isn't my issue,
I have no interest whatever in using Linux in any form for my day to day needs, that's not to say I won't play with it on a dual boot machine at some point, I've used Ubuntu and found it too much of a pain to get to grips with, it also frequently needed downloads, and when it fell over taking out my entire boot loader for windows And Linux, I quit there an then, I'm Not going back, so Please, zealots of XP and Linux of any flavour, do go on enjoying your particular platforms, but it isn't appropriate or useful to me here,
Please refer to my OP, I was asking Specifically about Macs and especially for experiences of Windows users who had migrated to it, Not Linux or XP!
Dianne, thanks for the comments and web url for the Yorkshire Mac user group, unfortunately the website is still under construction and the 'Join us' link is greyed out, but I'll keep an eye on it, got to support the home county! 
Martin, you have unwittingly posted the precise reason for my OP and why I'm considering moving to a Mac, why has it taken folks so long to grasp it!
"So the concensus from this thread, seems to be that the overwhelming advantage (for a Mac user), of a Mac over a PC, is its infrequent software updates."
Now (Hopefully) you understand WHY I'm asking about Macs!
"I do still wonder how the original poster will be able to download large files such as music, video or 'apps', with such a slow internet connection – I think it's this kind of content that Apple targets for it's users".
Martin, that is for me to worry about, but actually the only large files I ever download on a regular basis are endless updates for Windows and AV products and I'm sick of it!
Nigel B, Many Many thanks for that response, at last someone who understands data capping and similar restrictions, thanks too for that web url for motorhome wifi, Brilliant, I've spent ages trawling the web for such a service and never found one, the costs will work out similar to fixed line BB, but at least I'll only be paying when I use it and not tied into a fixed term annual contract, the last people you want to give bank RIB info too are French utility companies unless forced, especially their phone networks!
Re their charges €2 per day for 100 meg's, I'm assuming that if you don't use the 100 meg's, you lose it and not carried over to another day? I must confess, the thought of having 100 meg's a day to actually use and not see it vanish into a black hole through windows would be bliss!
John