From what I understand Cyfra + & N have merged to make one platform NC+. This platform will launch somethime in March but until then we won't know which channels they will offer. It is safe to assume it will include Canal+ Sport & TVN Turbo which will show SGP, World Cup and Polish League between them but in terms of other speedway showing channels we will have to wait & see when launched. Seperately both Cyfra+ and N both offered Eurosport (Euros) & Orange Sport (Swedish League) so it's hopeful these will continue on NC+.
The British League was on Polsat Sport Extra I believe but this was not on either Cyfra+ or N so doubtful if this will be part of the package. They both did offer Polsat Play which is different and didn't show the British League as far as I am aware.
Current Cyfra+ subscribers can continue with their current package until their subscription ends, or they can change to the NC+ when it is launched. New subscribers will have to wait for the NC+ to launch.
Cutting it a bit tight to get it all sorted for the first GP on the 23rd March