Ah well, I am glad I didn't book any more Flexi tickets after the one that I did book (AMS-LGW-AMS), which was very good but dated from before they included some free catering in the ticket price.
My big question is, when booking normal tickets (Standard) it was possible to order vouchers for the inflight catering that amounted to a 20% reduction in the cost of the voucher (i.e. a £5 voucher cost £4). I can't find that possibility anymore. Has it been discontinued?