It was a waste of time appealing. Nothing to worry about though. The POPLA decision has absolutely no bearing on anything going forward.
What do you imagine a "formal recovery notice" is? The next stage is going to a bunch of debt collector letters with a fake £70 added. Ignore those. The debt collectors are powerless to actually do anything except try and scare the low-hanging fruit on the gullible tree to capitulate and pay up. Never, ever, ever, communicate with a useless debt collector. Use their correspondence to line the bottom of a litter tray or some other use.
What is going to eventually happen, is that you will receive a Letter of Claim (LoC), usually issued through one of several possible bulk litigators. Most likely DCB Legal (not to be confused either their debt collecting arm, DCBL), Gladstones or BW Legal.
An LoC will give you 30 days to pay, not 14 like all the debt collector rubbish. I should be responded to, but if you don't, it is no big deal. If you get one, show us and we'll provide a suitable response.
Eventually, they will issue an N1SDT claim form through the CNBC. That has to be responded to. Again, when you receive it, show us the Particulars of Claim (PoC) and we can provide the necessary defence and instructions on how to do the Acknowledgement of Service (AoS).
These claims are easily defended and in the vast majority of cases, they never even get as far as a hearing as they are usually discontinued before the claimant has to pay the trial fee. That or they are struck out because of their defective PoC. Of the very few that actually get as far as a hearing, most are won (which is why they discontinue before paying the trial fee).
Any questions, feel free to ask.