Ok, take three... I've found a UK supplier of the fitting I need. I've ordered two.
If that fails, I'll try that place where you may or may not have got yours from!

I'm trying to avoid tipping the cab until it's been properly repaired. If I can get my full length hose to fit it will mean I can get the repairs done to the cab under cover rather than out on my driveway. Having it moving before the cab tilt is needed will be a real bonus. I can always return to the genuine parts later when it's solid enough to tilt again.