Loxlade

Hi, I've just got myself a C4 cactus and found myself without fuel or a petrol station nearby. Not to worry I thought. I have a jerry can with nozzle in my boot with spare diesel. Nightmare- it turns out the cactus have a misfuel prevention system on the fuel tank which doesn't allow a normal nozzle to be used? Does anyone know where I can buy a diesel adaptor for a fuel nozzle so that I don't find myself in this situation ever again? Or have any other work arounds for this problem? Thank you in advance Lauren