Reading through this thread, I am becoming increasingly uncomfortable about GA's approach - but I'm not too happy about our analysis either. Surely before we judge GA, we need to consider what they are doing broadly, before going on to the special pleading?
What I mean by this is that the first question is whether on all the facts GA are right to be seeking to recover Delay Repay (DR) that they have paid out. If the answer to that is 'yes', then the question becomes whether GA are entitled to hold and use the facts that they are relying on.
To my first question, I think the answer is 'yes': on the facts it appears that everyone who has shared their position with us exaggerated at least some of their DR claims. And it would seem that everyone has decided that it's worth going for an out of court settlement - essentially repaying all the DR they have received in the last year and a quarter or so, plus an admin fee in the low hundreds of pounds.
But the second question is whether GA are actually entitled to rely on the facts that they have. As I say, this is special pleading - that for some reason, GA should have to ignore something that they know. But in this case, on what we have been told about what data GA say they retain and for how long, the special pleading seems to have some merit. If GA say that they only hold journey details for twelve months, then it's hard to see how GA can now use journey details to challenge someone's travel pattern from 15 months ago.
But before relying on this, more research is needed. Have we correctly understood what GA say about their data retention policies? When do they start counting the 12 months (is it from the day of travel, or the end of the month of travel, or the end of the year of travel? Which year - calendar, tax or accounting?)? Are there exemptions in GDPR/DPA which allow GA to retain and use data despite their declared policies?
On the very limited information that we've seen (maybe half a dozen cases here?) GA seem to have accurately identified dubious cases. But on our current understanding of the law, GA's policies, and the facts, it's by no means clear that GA are entitled to hold the information that they've relied on, and so would be in difficulties were they to have to explain in court why they had concluded that DR should be repaid. So the dilemma that anyone receiving a letter from GA faces is whether to pay up (and resolve the matter at some financial expense) or to see whether they can argue that GA have failed to follow their rules and so eventually solve the matter - but certainly at the expense of some hassle, maybe some stress and (until we understand precisely what GA are allowed to do) some risk of failure.
On what we currently know, GA seem to be just on the dividing line between (on the one hand) enforcing their right not to pay DR when the claimant didn't suffer the delay they have claimed and (on the other) fishing for repayment when there's no particular evidence to think that repayment is due. I'm not happy if GA are fishing - and I would be happier if it was more obvious that GA are relying on properly held facts. On balance, I suspect that GA are in the right (surely they've thought through what information they are allowed to use?) - but it won't take much for me to change my mind.