The long length of run along the river back towards Hampton Court Palace had NO Marshall’s NO ONE to ask a question to. Very alone & at the time I was desperate for a toilet! As soon as I got to HCP & asked the firsts Marshall I saw where the nearest toilets were she replied “I don’t know” race ruined. Marshall’s on the whole were great but lack of knowledge Toilets & support along a major stretch would stop me taking part again.