You've misunderstood. They are in breach of contract for refusing to let me swap my date according to my original ticket T&Cs. There was availability within my fare code for the £100 date change fee + stopover tax without any fare difference. This was clearly stated.
They were insisting on adding £100 stopover fee but my T&Cs said a free stopover was permitted in each direction.
I studied contract law at university. This is a breach of contract.
I hadn't experienced this before but I know in the future that it is better to book immediately and state that you are paying the extra charge they added "under protest" because that legally means you're not accepting the unfair charge they added and yes you can claim that back.
Last edited by Alisonnoonan; Apr 19, 2019 at 4:49 am