Like what they do on the island with those mobile bacon sandwich vans.
Thats not a bad idea, you have two types in the UK - the stationary burger vans (they usually knock out great cheese burgers) the type you find at festivals and car boot sales, or the mobile hot food vans. They drive around industrial parks offering pastries, burgers, bacon sandwiches etc to hungry workers.
In Poland i actually found a stationary van serving hot kielbasa with a roll and mustard at a car park on the A4 motorway, it was around -12 with snow and ice everywhere, quite possibly the best kielbasa ive ever had.
The typical Polish burger thats nuked then piled high with cabbage and stuff is a real acquired taste, is Poland ready for the standard British cheeseburger, bacon sandwich or hot dog with onions? i think it well could be..
I think pies would do well in Poland, i have a great chicken, ham and leak pie recipe which ive cooked for many Poles and they absolutely love it. Many have never tried anything like it before.