IMHO it's a much deeper problem than Beagle and nick14 have mentioned.
There are a large number of instructors floating about who have somehow gained the privilege without gaining anywhere near the required knowledge, skill or the correct attitude. Or perhaps they had it once but have not bothered to maintain it. My worry is that some of these will fill in the form, pay £53 (no training required) and then revalidate pilots incorrectly.