PRINCE William sent an open letter to Thames Valley Air Ambulance to mark the start of Air Ambulance Week.

The Duke of Cambridge thanked all staff and volunteers on Monday for their 'tireless dedication' in helping to save lives every day across the Thames Valley, particularly during the Covid-19 pandemic.

The letter read: "The outbreak of Covid-19 has presented an immeasurable difficult challenge to all emergency responders.

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"You have had to adapt to new ways of working throughout the pandemic while continuing to provide a crucial lifeline to those who need it most.

"I also know that for an emergency funded almost entirely by public donations this will have an unsettling period for you all as fundraising activities have been curtailed."

The Duke also added that the air ambulance charity has played a 'vital' role in the frontline emergency response to the pandemic, with critical care skills in much demand.