- March 2018: Change Address. Send them a letter with my new address
- April 2018: Get a letter forwarded from my old address by Japan Post asking for payments for 2017-2018. Pay.
- June 2019: Wonder where this year's payment request is. Send them a letter asking that, and also reminding them my address changed.
- December 2019: Change address again. Send them another letter with my new address, also reminding them I'm still waiting to pay this year's pension. Include copies of previous letters too. Use registered post. Confirmation of delivery around a week later.
- 2020... Start to wonder if maybe I should write to my MP. Or more realistically at least brave the call centre first. But decide to give up for the time being because they're probably swamped with Universal Credit and subsidy claims.
- May 2020: Get a letter dated April 2020 asking for payment for 2018-2020 (two years) . Pay.
They have at least made the request for payment a lot clearer now, listing the exact bank details you need to transfer to on the letter itself. Previously you had to go online and do some detective work on the website to find the correct details.
(edited to add more details)