It so happens I'd like to replace them, any ideas where from to get these?

Edit: I figure I have to make some. I think I will use copper pipe, unless someone can tell me why I shouldn't.

 

Here's a tip; try Googling it.
That's what I just did.
https://www.jaguarclassicparts.com/u...k-brake-system

 

Well, it's not there, apparently it cannot be purchased without caliper. Not a big deal. Will make these by myself.

https://www.jaguarclassicparts.com/u...d-caliper-rear

Correction, it is there, £7.73 each. Plus shipping overseas and waiting. Perhaps not. Thanks anyway.

 

OK, after an internet search I ended up buying copper-nickel brake line from Amazon. Reviews are positive, easy to bend and rust-proof. Gee, how did they fix these Jaguars in ancient Rome, without internet?