I have just looked up the VFR approach chart for Luton (EGGW) and Kimpton Hall is shown as a VRP. So you are stuck with it; ATC is entitled to reference it - regardless of whether it is visible from the air to a non-local.
And consider this: Pre-GPS, did you draw your exact route on your map or VAC as required, with heading, timings and such? CTRs only have an 8-mile radius. That's four or five minutes flying time in the average spamcan. If you can't navigate visually for five minutes, then what?
It depends on where the 5 minutes is starting
A VRP which is hard to find is always going to be hard to find.
Local pilots always take the p1ss out of this - along with instructors, they know every sheep down there
Try it on a visiting pilot from say France.
I see a VRP at Luton which is a specific M1 junction. I never knew the M1 had only one junction
Fortunately, with the £500 landing+mandatory-handling cartel at all these airports, I don't suppose many people fly to Luton VFR
And transits are radar monitored anyway.
I would never buy a GPS which doesn't show the official VRPs, and if I was given a VRP by ATC which is "unofficial" I would tell them so. They should not be operating it. Well, except at my base airfield where I know where they are
On all my long VFR trips, I had scanned and georeferenced VFR charts all the way, with VRPs.