The march cut through the Nottinghamshire constituency of Conservative MP Mark Spencer. He accused the campaigners of scare-mongering.
"The NHS has been supplied by private firms since it was set up. The medicines and bandages are from private firms; even the GPs are, in effect, self-employed businesses.
"The key here is that the NHS is free at the point of delivery, and that won't change under a Conservative government."
But the so-called "People's March for the NHS" gives a strong indicator of the political battles ahead in the next general election.
Labour's Gloria De Piero joined the march as it made its way through her Ashfield constituency.
"Of course, I'm giving it my wholehearted support," she told me.
"Waiting lists are increasing at local hospitals here and nationally. People can see what is happening to their NHS and basically, they don't trust David Cameron to keep the NHS safe."
A more formal response came to me in a short statement from the Department for Health.
"By taking tough financial decisions elsewhere, this government has been able to increase the NHS budget by £12.7bn during this Parliament.
"We're committed to an NHS which continues to be free at the point of use for everyone who needs it."
The NHS Jarrow marchers have another week on the road; Northampton, Bedford and Luton are on the route. Then it's London and Parliament... and a big question: Will it have had the same impact as the original Jarrow Crusade? And will the sore feet have been worth it?
It mustn't be allowed to become a privatised market place. That would be a disaster for everyone”
Rajan MadhokRetired NHS doctor