While commenting - I will have my 2p worth - the new site is horrendous but is saving me time personally as not casually browsing like I used to.
Q: What happens in this scenario: Payments on account towards 2015/16 were innocently reduced to £200 each. On 31 Jan 2016 £200 was paid. Meantime, May 2016 ITR for 2015/16 submitted showing tax bill £800.
Will the next payment due be £200 on 31 July, then the balancing £400 on 31 Jan 2017?
Or will the next payment due be £600?