Asda is looking to cash in on mounting speculation that Prince William will pop the question to his long-time girlfriend – in the classic form of a commemorative mug.

A range of royal-themed crockery is reportedly ready to go on sale when news of the Prince’s expected engagement to Kate Middleton – widely tipped for this month – is made official.

“Royal crockery is a good British tradition and this will be the biggest announcement from the royal family since the engagement of Charles and Di," Asda category director David Mills told Reuters.

Middleton has been dubbed ‘waity Katie’ by sections of the media due to her reported frustration over the failure of a proposal to materialise to date.