Charles showed he's the King of cool this morning during a heatwave visit to a martial arts charity in London - where he met rap star Tinie Tempah. The Monarch donned a full suit, in light grey with a pale blue tie and matching pocketchief, despite soaring temperatures outside as he paid a visit to the Roger Gracie Brazilian Jiu Jitsu Academy in Hammersmith.Charles was in West London to learn how the charity Reorg uses the martial art to support serving military personnel, veterans and emergency service workers facing mental and physical challenges. One photo of the 77-year-old king saw him watching on - wearing a pair of plastic overshoes - as two fighters grappled with each other on a training mat. A fascinated King Charles looks on - wearing protective overshoes - as he watches a Jiu Jitsu match during a West London visit to learn more about the charity Reorg Gotta start somewhere! The King smiled as he received a white belt from martial arts expert Roger GracieAppearing on jovial form in spite of the hot weather London is enduring this week, the King spent time chatting to those helped by the charity. The Monarch spoke to Reorg's founder, Sam Sheriff MBE, a veteran of the Royal Marines - who also holds a black belt in the martial art.Sheriff established the charity nine years ago and now has 200 partner academies, including The Roger Gracie Academy, which was founded in 2004 by its namesake, a ten-time world champion.While Charles was presented with his own 'white belt', the first colour in the martial art's belt grading system, he also presented the most coveted colour to a member of the Reorg team. The Australian, also a trustee for the charity, has spent a decade reaching the highest colour after enduring a cancer battle. Charles also spent time with other students of the sport, including young people and those who enjoy over 50s classes. The King pictured with members of the Reorg team and students of the sport, including founder Sam Sheriff and rap star Tinie Tempah A few moves? The King, wearing blue plastic overshoes, joked with the martial arts experts during the visit Charles also welcomed members of the Afghan Refugee Women's Cricket Team at Clarence House this morningThe white belt isn't the only sporting garment the King has received this month, earlier in June, King Charles was presented with a personalised Grimsby Town FC jersey by the club's mascot during a visit to Blundell Park.Charles met the Mighty Mariner during a tour of the club's home ground in Grimsby, Cleethorpes, as the monarch inspected the black t-shirt that read 'HM King Charles' with the number 3.The logo of the club's local sponsor, Winner Winner Chicken Dinner, was also printed onto the jersey that Charles, who held an umbrella as it rained all morning, happily accepted.It's been a busy day for the monarch, who today also met with members of the Afghan Refugee Women's Cricket Team at Clarence House. The royal beamed and looked deeply immersed in the conversation as he chatted to the team.It had initially been set up 16 years ago, in 2010, during the Afghan Republic - but lost national recognition after the Taliban's return to power.Many female athletes from the team fled the country and are now based overseas, having rebuilt their lives as refugees.Last week, the King and Queen attended all five days of Ascot, leading the traditional royal procession down from Windsor Castle to the Berkshire racecourse in a fleet of carriages.Newlyweds Peter and Harriet Phillips, who married at a private ceremony in Kemble, Gloucestershire on June 6, were invited by Charles to join.Harriet, 45, opted for a stunning white maxi dress and matching white hat as she held hands with a smartly-dressed Peter, 48.The couple were spotted arm in arm and smiling as they arrived at the event today amid baking temperatures.A number of celebrities also flocked to the course, including Ellie Simmons OBE, Lisa Tan and Charlotte Hawkins.