Sorry to hear about your problems. First of all, according to Unlock's information here
on post-sentence supervision, the licence period and further supervision should add up to 12 months. So, it looks like the supervision ought to end in October. Anyway, recall to prison is for very serious breaches, and in the licence period there are other options available to them. In the circumstances, I'd be amazed if they sent you back to prison and they might well not do anything at all, which would explain your probation officer's comment about the recall not being authorised. With that in mind, and the fact that the police aren't interested, they may have decided to let the matter drop quietly, without losing face. In any case, if you are unhappy with how any of this has gone, you can pursue it with your probation officer's boss. Unlock has general information about that here
. I realise this is really stressful for you, but the longer it drags on, the less likely it probably is that anything will come of it. Even so, you need to make sure you have an appointment scheduled, so if you haven't got one from your probation officer, you could try emailing her, or writing to her (recorded delivery). If necessary, you could even take time off work and turn up at the office, hoping to see either her or the duty officer. Given that they have agreed verbally to let it drop, it should come down to getting confirmation of that, and they ought to be prepared to do it, although they'd probably want to to do it in a way that means they don't have to admit their mistake.
As Chris Stacey said: Although its not formally part of the sentence that is handed down in court, the criminal record that someone comes away with effectively becomes a second sentence, which can have a long-lasting, if not lifelong, impact.