They haven’t sent me a bill in at least 18 months , I’ve spoken to a few others in the trade and they are the same, Has this happend to any of you ,if so do you know why?

Since 2016 tax year Class 2 NIC is paid on your tax return same as Class 4. Your direct debit will have stopped for the Class 2.

You should have received a letter about new ways of paying.
Get in touch with them, as you really don’t want to miss your stamp.
My memory seems to recall paying every year, instead of monthly.

Yes as above. You now pay class 2 NIC as a lump sum at the end of the year, as part of your tax return.

If your accountant has done your tax return and you have paid this (too late if not 🙂 ) then you will have paid the NIC at the same time.

Thanks will ring Monday and speak to someone more knowledgable than the secretary this time.