Marek was a revelation around Wood Lane in 1977. His first meeting he registered a maximum and his outside sweeps on a notoriously flat track without much banking was a joy! He kind of lost his way the following year but I personally think that was down to him having to travel backwards and forwards to Poland to ride for his club team whereas in 1977 he wasn't expected to.
Eastbourme had a couple of Poles ride for them in 1980 but they lasted only a very short period (Jan Puk was one?) and compared to them Robert Slabon was a success but generally disappoining overal.
I saw Roman Jankowkski score a maximum at Swindon and remember the Polish/Swede who rode for the Robins (recommended by Jan Andersen I recall) but, again, was disappointing.