Messages have been posted on the fundraising page of the man who died during an arctic fundraising expedition. Among them are memories from friends, family and colleagues.
"A kind and loving gentleman with a beautiful soul. You will never be forgotten"
"We remember how much passion you put into this cause. May your soul rest in peace."
"Would have paid any money to have you back my friend still can't believe you are gone. rest in peace hope to see you again one day."
More top news
The high of 35C was recorded on a Bakerloo line train between Piccadilly Circus and Oxford Circus at 2pm.
Weather forecasters say temperatures could reach 35C, beating the previous record of 34.6C in the scorching summer of 1976.
After years of political manoeuvring over the future expansion of Heathrow Airport, there has been an important development this lunchtime.