The naïveté in the belief that an email can be “recalled” is your downfall. There is no such thing. Once an email has been sent, it has been delivered and the evidence is there.
Whilst Gmail and some other email agents may provide an “unsend” option, that only works if you select it, usually within about 5-10 seconds after hitting “send”, as the actual sending is on a delay. However, after this very short delay period, there is nothing you can do about it.
So, you need to hope that whatever you wrote is ambiguous enough to not dump you in the mire as the driver. Lesson learnt, hopefully.
If you cannot provide proof of purchase and your email blabs that you, the Keeper, were also the driver, then you’ve proverbially blow both feet off with a single shot and wasted your “golden ticket” defence for when this reaches litigation, which it will.
So, unless you show is a copy of what you have emailed to MET in BOTH emails, then it is difficult to advise you on how to deal with this going forward.