The other possibility to consider is that if the contract is worded so and Alex has one of those careers with keepers potentially lasting longer at the top level (touchwood!) then the Nix could be getting a piece of his transfers or new contracts for 20 years!
The other possibility to consider is that if the contract is worded so and Alex has one of those careers (touchwood!) then the Nix could be getting a piece of his transfers or new contracts for 20 years!