Thanks, monahos.

I wondered if that was the case. The problem is that I got the same response when I tried the other flights which were offered, also on other dates.

First problem: find (theoretical) availability, which is difficult enough as most dates are not available.

When you do find (theoretically) available dates and select the flights offered, they are not available.

Looiks like a phone call is needed - and we no longer have the 0800 number .