I may sound like a crazy lady. But I assure you, I'm certain it's the same two men!
Basically, they have a stall up in the middle of the shopping centre, trying to sell photo sessions. They have examples at their stalls, all old fashioned style pictures. The children or babies/families are dresses with frills or old fashioned caps etc.
The first time I saw them was with my mum, about 5/6 years ago. I have siblings 17 years younger and she was pressured heavily into signing up, and paying their £20 odd deposit. The rest was to be paid on the day of the 'photo shoot'. My mum is a very anxious type who cannot say no, bless her lovely soul. She opened her purse and didn't have any cash. We were near Asda so the man suggested "don't worry, use the cash point". So she did. And he followed her over there! 
He proceeded to stand right near her whilst she entered her pin to get cash out.
A week later, she tried going to the location she was told. Nobody was there. It was a warehouse. Nobody to be seen. Untraceable, we never saw them in the town centre again.
I came across them again a few months ago in a shopping centre nearby, about 10 miles away. They were there! It was definitely them! They came up to people, very in your face. One very old woman looking over 90 was being pressured to buy by the looks of it.
Here's the show stopper - I saw them YESTERDAY in my town centre! My mum lives in Essex, I live in the South East but miles and miles away. I kid you not, these same two men were standing there with the same shitting stall. I almost felt frightened (that's just me being silly, it was just so odd seeing them).
Can I go as far to question and report them, do you think?