THIS is the shocking moment a Foot Guard fainted during rehearsals today as beaming sunshine hit London and a health alert came into force.
Photographs show the soldier lying face down on the Mall in full uniform still clutching his rifle with the bearskin hat on.
Another soldier then comes to his aid and helps lift him up and back on to his feet as he clutches his sore head.
Today's rehearsal was for a state visit by the Emperor and Empress of Japan this week.
Tourists viewing the rehearsal in the shade behind a fence can be seen watching the scene unfold.
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London was basking in sunshine today with Heathrow recording 25C at midday, according to the Met Office.
It comes as the mercury is set to rise higher in the upcoming days, with figures potentially reaching up to 32C in parts by Thursday.
A yellow heat health alert has been issued by the UK Health Security Agency (UKHSA) and Met Office for most of England.
Forecasters have warned of a likely "increase in mortality across the population" from today until Thursday.
The heat alerts will be in force for every region of England except the north east, which is covered by a green alert.
The Ministry of Defence has been approached for comment.
