Actually the solution is very simple. Don't use a razor, only use a electric trimmer, and you will NEVER have any issues with rashes from a razor.
Second of all, for those of us that have to wear diapers I only "trim" about once every two weeks and it never becomes an issue and you are still able to stay clean easier.
Shaving daily is a hassle so I went to the expense of laser hair removal. If you don't want to go that route waxing is an alternative. I do think it is very important though for diaper wearers like myself to remove that hair down there for the clean factor. I get far fewer odors from urine wetness without having hair down there. And I can guarantee you will get less diaper rash.
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You might also consider using a dipillatory cream, just be VERY careful not to get to close to the important and very sensitive areas. Laser removal may also be an option in the U.K. for you. Check with your private physician.