AIBU unreasonable to think it's absolutely ridiculous the council tax valuation assessors only allow those who have been taxpayers of a property for under 6 months to challenge its Band valuation within those 6 months and if not then you're supposed just be ripped off and pay more than your neighbours? I have still made the proposal but advised it may be refused as I've been the taxpayer (overpaying) for too long.
The only reason I am challenging it now is because I had no idea beforehand. I have been taxpaying for 3 years and bought the same property 8 months ago.