Why? I'm from the UK and I think this is a good thing. The more that it is normalised that you should get refunds for delays the better. AirTransat cancelled my flight leaving the UK a few years ago and refused to refund it. I pointed out the regulations and they just said they won't refund so I had to do a chargeback. That worked; but it would be good to see airlines build refunds in to their processes.
Of course it is a good thing but nevertheless funny because it is something we take for granted. We are also used to get a compensation on top of the refund.
Btw escalate it to CAA and they will handle this. Not only you will get a refund but the compensation as well
