Thanks for the photo's.
I have bought some Borg and Beck traditional hoses. Here are some comparison photo's.
Goodridge v. Borg and Beck hoses by
Sabrebuilder, on Flickr
Goodridge v. Borg and Beck hoses by
Sabrebuilder, on Flickr
And they are clearly not designed to use copper washers.....
Borg and Beck brake hose by
Sabrebuilder, on Flickr
When you tighten them up you can feel them deform and create a good seal. No leaks so far!
With hindsight I'm thinking that it was actually the copper washer that was preventing the original Goodridge hoses sealing properly.
On my front calipers I did not fit copper washers and no leaks.