Chenzo

Hello HMRC I permanently live in Australia and have recently been given the banking details I need to use to make voluntary NI contributions. I was given a BIC number, an IBAN number, the account name and asked to use a reference made up from my national insurance number and name. When I go to enter these details into my Australian banking app to make a payment I'm only asked for the IBAN number, account name and a field entitled 'Details to payee' which I will use as the opportunity to provide my reference number (NI number and name combo) I'm not asked for BIC number but I am asked for the address of the payee. My question is, is the BIC number an absolute requirement given they're not asking for it and what address do I use? Thanking you in anticipation of your assistance with this.