still waiting for a message from Steve.
I Have however looked further into alternative solutions. as the estimated cost of 250 feels like being exploited for the brand name when the setrab oil cooler is priced on the 120-150 range.

I will be purchasing the bits needed to create a decent test jig for the cooler in order to pinpoint exactly where the leak is.
attempt fixing it using alluminium brazing technique, testing it to 13-15 bar on cold oil, and follow up with fitting in the car, and letting it warm up to see if temperature makes a difference.
There's a pirteck centre close by where i live (perks of living near birmingham) which i will visit next weekend in order to enquire about getting some new feed and return pipes
As a fallback I also have purchased some alluminium sheets in order to experiment with the strenght of the bonds in order to fabricate my own brakets for a standard setrab cooler which i can source from some place close to derby.
if the original fix doesnt work, and when i arrive to collect the setrab cooler i find it to need more work than just brackets i am expecting... then the last fallback is SJs