If BASSA persue the company for the repayment of travel costs then it will be yet another biased decision from a Union that can no longer see the wood for the trees.
I suspect that the HMRC would also be interested in such a move, as it would prove a clear financial motive and gain for commuting. It may well change the deal as far as the taxman is concerned, provoking a tax bill that may well exceed the value of the rebate. The "statute of limitations" on tax issues is, I think, 7 years.