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Here is an update: I phoned them on the freephone number as soon as they opened this morning. An extremely pleasant voice answered and the flight was still available at that price. I made the booking and got it through with accommodation added as well. So a good ending to what was an unpleasant experience. Yes, I have paid perhaps £15 more than going straight to the airline and booking the accommodation separately but it was an urgent requirement and I was tired of searching all the combinations which are not available on the airline sites without putting in each one at a time whereas the agency sites sweep through. Yes, it is possible to use the agency site and then use the optimum choice there over on the actual airline's site. With more time I might do things differently but above all I needed to get hold of the agency to clarify whether I had one, more or any booking before doing anything else. There was no explanation as to what had happened.