Could well be the starter motor but it might be worth checking the battery and earth connections before condeming it.

Yes somebody else mentioned that it might be the connections to the battery that may need looking at. I am hoping that it is that, as a starter motor would be quite pricey.

My mechanic is looking at it on Monday, considering we are going to have a few days cold weather, I don't want to be jump starting my car every day. Thanks

Is it petrol or diesel?

It's petrol.

Somebody mentioned that I might need an oil change, but I suspect that's unlikely, as I only had one done in mid Aug and I've only done 2k since.

Somebody mentioned that I might need an oil change,

Somebody doesn't know what they're talking about.

Engine earth strap mount, battery earth strap mount or high-current connection to the starter itself has to be favourite. Remove each, clean both the lead and the point of contact thoroughly and reattach with a light smear of vaseline.

If it does turn out to be the starter itself, if the existing one spins freely when off the car, before lashing out on a new one try changing its brushes and giving the commutator a good clean. Only costs pennies and often fixes the problem. The windings very rarely give up so, if the bearings are ok, it's usually the brushes.

Thanks very much for the advice, I shall let you know on Monday, but from what you've said it does make sense.

Another common place susceptible to damp, which is so easy to fettle it's worth doing first, are the connections to the battery itself.

Remove, clean, vaseline and reattach.