Thank you Scunner for posting so early.
I was looking for flights from about 5:45am but they only went as far as August. I kept refreshing the page (Both F5 and Ctrl+F5) but still nothing beyond August.
About 6:10am I logged on to Calis Beach and saw your post. I had been using Firefox as a browser but then opened Internet Explorer and that up came the October dates.
We live in Bedford so usually fly from Luton, but can easily fly from Stansted, East Midlands, or Birmingham. The flights for our dates from Luton were £520, so I checked from Stansted and they were £370, so booked from Stansted.
It was Scunner's early post that prompted me to dig deeper, having failed to get the dates to come up, so thanks again.
The lessons I have learned from this are:
1) Calis Beach Forum is brilliant (But I knew that anyway)
2) Always have a second browser available
3) Check several airports if you are lucky enough to have a choice