Have you topped up a UK pension to cover gaps?

[Per_Travels]

If you have been approved to pay NI contributions at the Class 2 rate you will receive a letter each UK tax year detailing the amount owing for that year. As mentioned by @SydneySwan you have the option to set up a direct debit for these ongoing payments.

How long did it take for your contributions to be reflected in your account?

I paid on the 17th Oct last year. Nothing appeared on my account and I called them last week to check they'd actually received the money. Person I spoke to said they could see it in my account and then offered to do the allocation straight away. This was then reflected in my account (and updated pension summary) a couple of days later.