everyone will get LVL 6 automatically as part of revalidation.
Well, not quite. As I understand, if you "revalidate by experience" you don't get level 6 automatically. Unless your examiner, who has to be a native speaker of English (level 6 himself), holds a UK-issued (JAR-FCL) license and is able to deduce from the short verbal exchange "can you sign my license? I've got 12 hours including one dual - here's my logbook" that you're indeed a level 6.
In my particular case, being the proud owner of a UK-issued JAR-FCL PPL but a Dutch native speaker and a resident of the Netherlands, this will mean a one or two-hour exam costing me 130 euros at least. Because the clubs examiner doesn't hold a UK-issued license but rather a Dutch JAR-FCL compliant one.
For me, it's all a bit overkill. Although I am a Dutch native speaker, my English is excellent and I can pass for a native except for the fact that my accent is a mixture of UK/US/Texan and Australian English. I have taught IT courses and presented at conferences in all sorts of foreign countries, including the UK, US, Texas and Australia and consider myself quite fluent. If I could phone somebody up (like Jumbo Driver) and have my records amended to a 6, I would be very happy.