Just a quickie (and apologies if it has been done loads of times previously). I'm travelling from Reading to Paddington en route home on Sunday 22nd December. I understand crew shortages likely to result in fewer GWR services that day. I already have a standard off-peak ticket. Can I travel on the Elizabeth Line using my ticket or do I need to pay again? I'm only going as far as Paddington (I always walk to Euston or KC from there). Thanks!