There probably is a brake fitting but I couldn’t find one.

I did find that a Suzuki jimny flexible pipe has a 10mm banjo on one end and a 10mm thread on the other.  I used a copper pipe with 3/16 pipe on one end and a 10mm male on the other to connect to the flexible jimny pipe.

It’s a bit of a long way around but it worked! 

After a bit of searching I came up with these.
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M10x1 banjo adapter to allow you to use 3/16" copper brake pipe instead of trying to find one of those ridiculously long double ended banjo flexi hoses. I found these at
https://www.brtmotorsport.co.uk/collections/brake-fitting-adaptors/products/m10-3-8-stainless-steel-banjo-adaptor-with-m10x1-male-thread
You will also require these m10x1 female brake pipe tube nut.
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I'm in the process of connecting it all up at the moment so we'll let you know how it goes.