I can't personally speak for a 2015 reg 1.2, but our old 60 plate 1.2 POP, I think that used to be about average around town but on a long run, well over 50mpg was the norm.
It very much depends on how you are using the car. You can't for instance expect to be just using the car for city driving and expect a great deal more out of it than that. On a good motorway run however, it will improve.
The other thing is, the engine barely has enough miles on it yet to have fully 'bedded' in. Ok, all engines are run in on a test bench at the factory, but it will take a few thousand miles for the engine to become optimal. Don't rag the car unnecessarily, you won't do it any favours. Also, make sure you keep it serviced and don't fall into the trap of waiting until 18k or two years for its first service. I'd change the oil on the first go at around 6k miles.
I was initially worried about the mpg we were getting on our TA when we bought it, low forties, but it now seems to have settled around 47mpg on the type of everyday run my missus uses it for. We have done a few 'long distance' journeys in the car now, but it still won't go above 58mpg, though there are some dodery old snails on the forum who can eek 70 odd mpg out of their cars, but it takes them around a week to get to their destinations lol! :devil: