On 8 Jun, 13:27, The Natural Philosopher wrote:
And..as an afterthought they helpfully add.."V11 references are only
valid from the 15th day of the month preceding the expiry of the current
tax disc"

So, they send out a reminder at the beginning of the month, but disallow
its use for a fortnight?

I assume its just another job creation scheme, to ensure that they need
extra staff to process it around the month end.

Fer *** sake, if I can't use the thing, why send it in the first place?

From an administration point of view, they need to send out roughly
reminders for 1/12 of the number of cars in the country every month.
Therefore, they are not going to be able to do that on a single day so
would assume they are sent out from the 1st - 15th. Then from the 16th
to 31st they can start sending out the tax discs. This keeps it simple.