The comedian stepped out of the limelight a few years ago citing "unforeseen family circumstances", but made a brief comeback for two live shows over the weekend to help out an old family friend whose daughter is being treated for a rare form of cancer.
As Kay appeared at the Manchester Apollo on Saturday, he took questions from his fans in the audience – including one about whether he would ever do a new Christmas special of hit sitcom Car Share.
Fans were delighted to hear Kay say he "might do" before revealing that the series – in which he stars with Sian Gibson – was his favourite work.
He said: “Of all the things I’ve ever done, that’s my favourite of all. I love being with Sian and we had a good laugh.”
But he added that filming inside a car with COVID restrictions still in place would be “a lot of work”.
Car Share stars Kay as supermarket assistant manager John and Gibson as promotions rep Kayleigh, and follows their friendship and romance as they share a car to and from work while singing along to the radio.
There was also more good news for Max and Paddy fans, as Kay revealed he had written two new episodes of the sitcom – in which he starred with Paddy McGuinness – that he would consider making.
On making Max and Paddy with McGuinness, he said: “It was one of the best times.”
Kay was performing the one-off shows at the Manchester Apollo to help fundraise for treatment for 20-year-old Laura Nuttall, who is hoping to travel to Germany to battle a rare type of brain cancer called glioblastoma multiforme.
She was given 12 to 18 months to live when she was diagnosed at 18, but she and her family hope the German treatment could prove lifesaving.
Kay used to work with Nuttall's father but had lost touch with the family until he saw them on the news talking about their fundraising and got back in contact, offering to put on a stand-up show for them.
Watch: Why Peter Kay is coming back to stage