Just to update this thread, in case anyone else has a similar issue.
Taff’s solution was to add it to the windows firewall.. seems obvious but as I definitely already had access to the internet and network, it didn’t seem the answer, but I pursued it anyways.
Itunes did have a listing in the windows firewall already, so I didn’t add it straight away, but did the iTune network diagnostics, which reported it could access the network/internet fine though also reported it didn’t have an entry in the window firewall.
Very bizarre, so I manually added it (above the entry already there) and iTunes agrees now it has an entry when using the diagnostic.
No !’s listed in Itune now, so will see how it goes. 😀