It's a sad, sad situation
The Sun newspaper is reporting that Pet Shop Boys “pulled out” of the Brits. This is not true.
It is true that Pet Shop Boys had been asked to be part of the performance of their song ‘It’s a sin’ with Years & Years and Elton John and that they co-produced the new version for the Brits with their long-term producer Stuart Price.
It is not true that “creative differences” led to them not appearing. The staging and casting ideas were approved by PSB along with Olly Alexander and Elton John. The non-appearance of PSB was ultimately due to a contractual issue that proved unresolvable.