Agreed, goto a proper barrister and get a second legal opinion.
Even from the thread title you are defeated already.
I fail to see how their case is ‘watertight’ if you never requested her to send this image. And, honestly, I would never plead guilty to saying ‘I’m a sex offender’.
Also, honestly, from what I’ve read, I think a sex offence is generally unfiltered, and from what I gather that means even after the time period it will remain on a DBS check, I could be wrong on that, but if that is the case, you are screwed either way so you might aswell go down fighting.
I couldn’t actually believe this is the actual law, I read that if two 17 year olds are texting each other and send a naked photo they could be arrested for this, despite the fact they can legally have sex.