He did "cavort" with a Czeck spy. He had at three meetings.
He sold no secrets. Jezza did not have access to any.
He was just being groomed for future use.

BBC yesterday,
"Nothing in Agent Dymic's descriptions of three meetings with the Labour MP - two in the House of Commons, one on Seven Sisters Road - suggest the StB ever regarded him as anything other than a potential source."

That is according to the actual official records of the Czechoslovak communist era secret police, the StB, as reported by the BBC.
http://www.bbc.co.uk/news/world-europe-43168245