Please can you advise.The last couple of years when the snow is bad,we have left the GTI on the drive and only used the mk6 1.4 which is great in the snow no probs whatsoever.Due to a change in circumstance,this year both cars will need to be used.Can I put similar 15" steel wheels on the GTI with no issues so I can stay mobile?
You will need 16" wheels minimum to clear the brakes, I'm afraid.
205/55/16 I believe is the VW approved winter tyre size.
You should be able to pick up a cheap set of 16" or 17" wheels and get winter tyres on those.
As long as they are 6"-8" wide and ET40-50ish, 5 x 112 PCD, they should be fine.
Plenty of OEM Aldi,VW/SEAT/Skoda wheels to choose from.