Well, it is a total no-brainer to take them to London Tribunals as there is no re-offer of the discount, plus their extremely tardy response to your reps. 5 months is really quite ridiculous, and you should emphasise this in your reps to LT. Yes, it is LLA & TfL Act 2003, and not the TMA 2004, which imposes 56 days max for response. Any adudicator worth his pay should regard 5 months to respond as abuse of process.