Originally Posted by
umbyboy
Border Force just confirmed that he'll need a Direct Airside Transit visa (DATV).
With separate tickets and checked luggage , I think he will need a Visitor in Transit visa
When the following question is answered yes to
Originally Posted by gov.uk
Will you pass through UK border control?
You always pass through border control if you:
##leave the main airport building for any reason
##need to collect your bags and check them in to your onward flight
it indicates a requirement for the Visitor in Transit visa