Sure you can ride it offroad but it isn’t much fun.
I think you’re bike is suspect, most people, including myself, think they are ace fun.
If the OP is in Surrey and a 54cm Croix would fit he can come and try mine.
The stock one is a bit heavy though, basically because of the wheels/tyres.
A good strategy is to buy a 2nd hand one for about 650-700 and then later buy some decent wheels.
I recommended this to my mate, he bought a mint one for 700 and then hasn’t changed the wheels. Consequently he is a bit ‘meh’ about it, but then noticed how he could climb hills he had failed on with mine, which has the same gearing but has better wheels (and 105/ultegra instead of tiagra).
I built mine and it has iron cross on hope at 1610g and salsa cowbell bars and I think it is great fun for fitness work round the common.