Well I've taken matters into my own hands after more radio silence from solicitors.
I called land registry (40 min waiting time)
Spoke to a really helpful chap who has told me everything I needed to know.
There is first and foremost an issue with the mapping at their end and the piece of land the query sits against actually IS registered and always has been, but there is another (smaller) piece of land between ours and the neighbouring property which is unregistered - it is actually incorporated into the neighbouring garden, which I already knew as we looked at that property over two years ago and the EA told us the additional driveway could be subject to change due to a ransom strip of land......
I am kicking myself that I didn't remember this from back then, but hey ho, this is where we are at.
The man I spoke to at land registry has confirmed our matter is expedited and he has forwarded it urgently to the team manager as the original case handler is off sick.
This is the LAST outstanding matter and could resolve within a few hours this afternoon.
So all is not lost right now, but beyond this I'm at the end of my tether.
I tripped over a box this morning and smacked my head on a doorframe, and I'm totally fed up of it!!