Photo from John Lewis website. Looks a decent size.
Thank you. I think Argos have the title wrong so I've updated. Having zoomed in it says "1 SET" on the box.
These modern Meccano sets use really small scale parts so they're tiny, not like proper Meccano (if they still sell it).
I think this has appeared here before. It was set number 5 rather than being a set of 5.