Support vehicles are discouraged. But foolish to have a rule you can't enforce.
The rule is that any support must be away from controls and 'off the recommended course'.
If a rider has a wonderful relationship with someone who wants to support them, despite the fact that controls offer all the support needed, the recommendation is for the rider to leave the course and meet their support vehicle at an RV well away (I suggest a mile away). And then rejoin the route where the rider left it.
FAQ Answer: "We do not permit personal support vehicles. These can be a hazard to riders. In particular, they can be a hazard when driving along the route and when parked on narrow roads.
- "Any rider seen to receive support from an unregistered vehicle on the route will receive a time penalty according to the published tariff of penalties."
LEL is not PBP. I have not seen any "tariff of penalties", with the exception of attempting or actually connecting a power socket with a device in a control (2 hours).
On no account is a vehicle being so used drive on any roads on the recommended course.
In extremis, the organiser can decide not to validate a rider's completion of the course.