I had a misunderstanding in the measurements required - be careful, the leg measurement is the total outside length of the jeans, from the top of the waistband to the bottom of the leg hem - not a normal inseam measurement that I took for granted.
The MYOJ fit guarantee allowed for me to alter my measurements and get the jeans remade for free. The MYOJ team were also understanding that I was on holidays when the jeans were delivered so even though I was unable to trigger the re-make within the standard time frame, they reactivated the option in the online form and I progressed without issues.
I am very happy with the final result and will definitely buy more in future.