Each time Republican protesters broke out into chants of 'not my King', concerted boos and jeers went up from the rest of the crowd, before turning into cheers when the protesters were drowned out.
Elaine Myatt, 63, from Stoke on Trent said: 'I'm not having it. It's an insult to to the King. The protesters have taken up a prime position and Charles is going to come past here and see them when he could see the thousands of us who are cheering and supporting him.'
Her friend Jenny Gannon, 66, also from Stoke, agreed and said: 'Who would replace the King if we were to become a republic? I certainly wouldn't want a president Boris Johnson.'
The Clay family from Ashford, Kent, were amongst some of the loudest people expressing their support for the monarchy and drowning out the protesters - and were showing no signs of fatigue despite their 5am start.
Grandmother Maggie Clay, her daughters Georgina and Alex, and grandchildren Marnie, 11, Micky, 7 and Beau, 6, labelled the protesters 'fun sponges' and said they had only shown up to spoil the day for people who like the Royal family rather than out of any real conviction. They had even recruited an American tourist to join in with their cheers.
Ms Clay said: 'We've been shouting back at them because they're party poopers. We're just here trying to have a good time.
'They [the protestors] are all going to have the Monday Bank Holiday off aren't they. They're probably going to have a drink after this with their friends too. It's hypocrisy.'
You could play bingo with a lot of those statements.