Thanks again for all the help everyone.
After doing a lot of reading around I ended up creating a dataset and sharing it out via Samba.
I didn’t use ZFS’ built in Samba sharing and instead set it all up manually so I could have Windows take over permissions on certain folders and have Linux take care of some others (I have a mixed environment at home).
It’s working beautifully, I’ve only got around 40GB of data on there at the moment and I’m going to make sure that’s ok for the next 2 weeks or so before migrating the rest of the data and turning off the old server.
I’ve been reading a lot into datasets and it’s pretty interesting what you can do with them, one thing I have learnt though is that I need to get out of the habit of treating this like a traditional filesystem 
Thanks again
Steve