Giacomo you are correct!

I looked into this a little more and then spoke to my insurers. The guy there had to phone the underwriters to confirm, and the underwriters had to phone somebody else but it turns out I am covered with the minimum third party liability insurance of whichever country I'm in for the duration of my policy.
The problem I had is that the original person I spoke to several months ago at my insurance company told me once the 90 days european cover they provide has expired I wont be insured anymore. This is only the fully comprehensive cover and any other add ons which were with the policy.

On closer inspection of my insurance documents I found this statement on a seperate document to my certificate:

"This certificate of motor insurance takes the place of am International Motor Insurance Card (Green Card) and is evidence that the insurance extends to include the compulsory motor insurance requirements of:
- any member if the European Union
- Iceland, Norway, Croatia, Switzerland & Liechtenstein"

And as the certificate states the 12 months coverage in the UK, it also has the 12 months in the EU.

I learnt something new today... as did the guy at my insurance company!

Thanks again everyone - spring riding here I come