I rode the Elizabeth Line for the first time during a recent trip to London. I travelled from Euston Square to East Putney via Farringdon, the Elizabeth Line and Paddington and was charged £2.60 for the journey but received an automated refund of £1.30 when I touched out of the Elizabeth Line at Paddington, effectively reducing the fare that I paid to £1.30. What is the purpose of this automated refund? Do you always get one when you change between the Elizabeth Line and the Underground at Paddington?