So no one asked for an update but I HAVE ONE!! 
I attempted to contact the seller a few more times and with no response I figured - my moneys gone.
Annoyed, I created a new account on gumtree under a different name. To just make sure (because my good side was telling me maybe somethings happened, and as Iv had a close bereavement recently I know how it can be).
I found the advert I had originally replied to and asked if it was available. She said ‘yes’.
Well I thought, that’s just bloody great! So I asked if she has paypal. Again... ‘yes I do’
So she intended to scam me from the get go! (No shit, I know)
Well, I wanted to find out some more, see if i could find out who the person was behind the advert and scare her a little for being a scamming bastard.
The next few days involved lots of ‘what’s your home address I’ll collect, to I’m sending the money now’
She pressured me everyday to send the money, saying lots of people were interested, that she was at the post office RIGHT NOW so if I sent the money she’d post it (I hadn’t given her my address for my ‘fake account’!) etc etc.
Each time I’d say yes brilliant I am sending it over now. Then ignore her Til the next day. And begin again.
I arranged to meet her at a certain time to collect and then was a no show. And after that I feel she must have clicked I was bluffing. At this point I messaged her saying ‘yes, it’s annoying when people lie isn’t it?’
While this went on, I found out who she was. A bit of digging with the info she gave me, coupled with a photo on her wide open Instagram of her WITH THE ITEM she said she was selling. I fired off a message, stil lthinking id never see my money again saying
‘Myself and gumtree have forwarded your details onto the police, as Iv been advised this is a police matter. I’d prepare for your pending interview next week...’
She replied back ‘ I don’t know what your talking about? Who exactly have I scammed ?! 😂😂’
I replied ‘ you know what I am talking about.’
Within 20 minutes, my account had been refunded the money she scammed from me.
I GOT MY MONEY BACK!!!!
I sent one more message saying Thankyou for doing the right thing, I’ll let the police know you have refunded me. Don’t do it again!