I'm travelling from Paddington to Warminister return tomorrow only options were TOD (may be in a rush and don't want to spend time on collecting tickets also have purchased any permitted routing) and on GWR App. I've screen grabbed the QR code/ eticket from my iPhone and printed it out as a backup in case phone dies, is the paper copy likely to open barriers and be valid? Also if I decide to return via SWR to Waterloo , will the QR / eticket cause any grief at Waterloo?