By 1988, digital tuners were starting to become common as factory fitted or manufacturer spec equipment. Blaupunkt Cambridge models seems to have been quite popular.
Mine's a 1986 GT, which has a push button Blaupunkt London MR21 fitted. At this time, I don't think ICE was fitted at the factory as different cars seem to have different stereos fitted. I spoke to someone who worked at a VW dealer in the '80s who said that dealers had a stock of equivalent level models (usually Blaupunkt) that they would fit to new stock cars. Seems odd, but tallies with my own observations that original stereos in Sciroccos of the same age vary quite a lot but are generally the same spec Blaupunkt London's, Hamburg's and Cambridge's.