In both projects Tim removed the spare wheel so the hose would have the space to 'travel' from the internal roller guide to the external Fairleads guide.
His original idea was to carry a puncture repair aerosol can in case he suffered a flat tyre as he didn't have space in the Berlingo cargo area (his first project) to carry his spare. Whilst the suppliers of this stuff promote the good, they fail to advise about the negatives.
The instructions on the tin tell you to identify where the puncture is and list a detailed procedure of what needs to be done to get the fluid to seal the hole. The tyre puncture hole needs to be at the bottom before filling the tyre with the aerosol and also involves moving the car back and forwards so the stuff can find a way into the puncture.
You then drive very slowly to the nearest tyre supplier where they will tell you that they can't repair a puncture where the tyre has been filled with aerosol, so you will need to buy a new tyre.
So its best to try to find a place inside for your spare wheel.