Back again!

The company I found for long stay insurance is www.travelinsurance.co.uk (hope posting the link on here is OK) I entered our details and got a quote for their Gold cover of £198 for a 180 day trip.

Friends who stay for 6 months at a time recommended 'Visitor' medical insurance which they find is cheaper for them. They are in their 60's. Obviously that doesnt cover any travel related problems you may have.