Dan could solve this by not riding for a polish club. But having thought about this for less than a few seconds there is one reason why he wouldn't quit Poland and we all know the answer. 

Wow! I almost spat my coffee out when reading that!!

Massive Polish Zloty in exchange for power and control. The Polish contract is a classic case of how much is your freedom worth to you when it comes to your Speedway career? No point in any rider complaining about any ruling by the Polish because they've got no choice but to oblige once the ink is dry on the Polish contracts that they've personally signed.

It seemed nailed on they'd both be at Worky next year. Can't see them not being in the same side 

No, we don't want as many tracks as possible next season, if it means delay in planning fixtures, meaning fans can't plan accordingly,, riders don't wait and sign elsewhere (even more important given the new restrictions), and the inevitable "cobbled together" septet is destined, before a wheel is turned, to finish miles adrift at the bottom of the league.. Far better to run with what they have, consolidate, and, should a team, or teams, want to come back then they can spend a season doing open meetings to gauge viability... A professional business has control, vision and a several year growth plan using best case/worst case parameter scenarios, and builds their future operating model and business plans accordingly on the forecasted positions... What a professional business doesn't do is reach the end of their financial year, and, only then start to build next year's plan, or, unless it is "Donald Ducked" fundamentally change it... It certainly wouldn't stretch any meagre resource pool it currently has further by bringing more complexity into its operations.. Run next year as planned, and build in future growth accordingly as and when it enhances the product..  

What exactly is the angle in court? Polish contract: you must limit your employment to ours and a maximum of 2 others = not a violation of human rights. ACU licence: you must ride in British speedway to be granted start permission abroad with an ACU licence = violation of human rights...? There's no obligation to take out an ACU licence - I'm sure there's a lot of other federations who would happily allow him to take out a licence. However, as with Polish contracts, you have to deal with the consequences.