Thankyou everyone for all your encouragement.
I've been ok today, probably because of the patches. I'm not sure how it will be when I stop using them, but I'll try and cross that bridge when I come to it. As Trev said to me earlier, before I went to see my mum (who is recovering steadily), every day without cigs is an individual victory, so I've "won" for the last 8 days so far.
I am feeling much more optimistic this time, partly because of the patches and partly because Trev has, so far, been successful in quitting. I think on the previous couple of occasions, I really didn't totally believe I could do it either time, but this time I do. If I do fall off the wagon, I will need to get back on it as soon as I can, instead of giving in to the cravings like I did before.