I don't know why my previous post was not allowed by the moderators. I was only trying to provide helpful pointers for other people making voluntary payments. Hopefully, they will allow this one.
Here is what I did:
1) I transferred my payment by bank transfer
2) then a few days later sent a covering letter, stating which years to allocate the payment to
It took just over 3 weeks for this to be reflected in my on-line pension forecast.
If you do a bank transfer to 'HMRC NIC Receipts' (20-20-48, 30944793) with the correct reference ('NINOICSURNAMEINITIAL'), does is automatically get allocated to your NI contributions? IE. does it happen immediately, or is it a manual process which takes a while?
I'm wondering how long to wait, after doing a bank transfer, to call the NI Helpline.
Re. "We currently are not accepting cheque payments."
I wonder what will happen to the cheque I have sent? Will it be returned to me, or destroyed?
I might leave it a few more weeks and see if it gets cashed. If not, I suppose my only option would be to get the bank to stop the cheque.