You may be in luck! Somewhere in my loft are three VHS cassettes containing all the Buccaneer episodes when the series was repeated on UK Gold in the mid 90s. I was working at LUT when the series was being filmed and wanted a copy for posterity!
The old Britannia fuselage used for static filming may still be extant on the fire dump there. Though more likely it has succumbed to the elements after 30 years exposure.