EPC/Emission Control Lights on - Help!

I have a 56 plate Ibiza DAB 1.4 (47k miles). Drove the car first thing this morning and no warning lights were on show. Left the car at my local railway station to commute to work and on my return tonight the EPC and Emission control lights are on. The car has been on an icy/snowy car park all day. I'm also finding that acceleration cut out twice on the way home. Been checking around the forums for ideas and have checked the brake lights which are working fine. Also tried the 6 starts but no joy, the two lights are still on.

I'm going to take the car to the garage in the morning but wanted to get an idea of whether this is related to the cold weather or something more sinister. It seems to be that others have had brake switches replaced.

Any advice would be greatly appreciated. This is the first time the car has had a problem in 3 years.

Thanks, I might download the diag tool and see what errors get thrown up before going to the garage.

Mate of mine has one I can borrow so should be ok.

Did the check first thing today, throttle body problem. Garage confirmed this so feared the worst. However, they cleaned it up and cleared the error. Apparently the part was covered in dirt and all sorts which they suggested may have been down to the snow and ice recently. Drove back home and so far so good but watching the displays like a hawk. £75 for the work done but if the error comes back its £500 for a new throttle body, Stealers, don't you just love em!