Thanks everyone for the replies.
AM1874, I'm going to step up the exercise a bit, I have admittedly been using the weather as an excuse not to go so far on the bike. It's not the rain that bothers me so much it's a morbid dread of having to wash the bike afterwards. That's what 50 years of cycling in the west of Scotland can do for you.....
I read with interest the thread Goonergal directed me to and it seems that I should perhaps give my system a bit of a kick start by doing a bit of feasting as well as fasting. ****, I was getting used to fasting ! Never mind, if I've done it once I can do it again.
So I've started today by raising my cards and calories and I'll continue this for another couple of days and see what happens.
Bulkbiker also pointed me to 2ketodudes and I've been listening to them today. They're quite....boisterously enthusiastic...I would say. But once I get used to their speech patterns, I find them rather refreshing and, to borrow their speech idiom, "They don't talk **** !"
I'm trying to get them onto my iPod so that I can listen to them while I'm out walking, but that's another task to keep the grey cells occupied.
Thanks again everyone.