Yes, durhamjen - my husband I both walked from Edmonton Green to Trafalgar Square on Saturday. I was quite achy yesterday - and that was after only ten miles or so, so I had great admiration for those who had walked the entire route.
Most bystanders seemed interested to take the leaflets that we were handing out on the way, and started to read them straight away (so they didn't immediately end up in the bin!). We also got a lot of support from passing traffic so it was really quite heartening.
I'm sure, in all, there were more than 5,000 participants - I would have said more like 15,000. I haven't seen any news coverage but I haven't particularly been looking out for it because, having gone on the Manchester demo last year where an estimated 50,000 people marched, I didn't expect much.