Update.
Read through the thread -
https://www.landyzone.co.uk/land-rover/pcv-valve-fix.236334/ which Hippo posted - thank you, and ordered this:
http://www.rimmerbros.co.uk/Item--i-LYC100510
Came today and it is the part. It's listed as something to do with the dipstick tube on Rovers but connectors for Land Rovers????.
Can now put it back together.
Thank you for the help and guidance, hopefully this will help others.