FYI: Almost certain that one must need Transit Visa if one travels on AP through UK

exemptions

I dont think so

Exemptions: You are exempt from this requirement if:


You hold a valid US or Canadian visa who also hold a ticket to or from the US or Canada routed via the UK. This will include a period of 48 hours after the expiry of the US or Canadian visa for those leaving the US or Canada to allow for those who choose to leave at the very end of the validity of their visa

You hold a USA Permanent Resident Card (Green Card) issued on or after 21 April 1998.

You hold a Canadian Permanent Resident Card issued on or after 28 June 2002

You hold a valid Category D visa (normally printed on a red/pink sticker, green stickers do not qualify) issued by EU/EEA member states, which are valid for more than 3 months.

You hold a valid EU residence permit

You hold a diplomatic or service passport issued by the Peoples Republic of China

You hold a diplomatic or official passport issued by the Government of India
If you qualify from one of the above exemptions you are not required to hold a Direct Airside Transit visa and may still benefit from the Transit without Visa concession.
 
But one will need transit visa if H1 is expired and you are working on EAD and travelling on AP.
 
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