There's lots of information in this thread but if I'm understanding it correctly you were caught travelling with an out of date railcard when travelling with Greater Anglia. There are a couple of things to consider:
1. The journey where you were caught
From what's been said you paid a Penalty Fare costing £57.20. Greater Anglia can take no further action against you in respect of this journey.
2. Other journeys you've made with the expired railcard
Greater Anglia will audit your Trainline account and discover that you've travelled with invalid tickets since your railcard expired and will probably write to you about this. If you co-operate with them I expect thwy will offer you an out of court settlement. Expect to have to pay the cost of the fares at the full Anytime rate with no credit given for the invalid tickets you did purchase, plus an admin fee typically £150.
If Greater Angklia do contact you about other journeys then post a copy of their letter in this thread (do redact any personal details) along with your draft reply and we can assist with proof reading.
1. The journey where you were caught
From what's been said you paid a Penalty Fare costing £57.20. Greater Anglia can take no further action against you in respect of this journey.
2. Other journeys you've made with the expired railcard
Greater Anglia will audit your Trainline account and discover that you've travelled with invalid tickets since your railcard expired and will probably write to you about this. If you co-operate with them I expect thwy will offer you an out of court settlement. Expect to have to pay the cost of the fares at the full Anytime rate with no credit given for the invalid tickets you did purchase, plus an admin fee typically £150.
If Greater Angklia do contact you about other journeys then post a copy of their letter in this thread (do redact any personal details) along with your draft reply and we can assist with proof reading.