I was issued a penalty fare after tapping in at Liverpool Street station to travel on the Stansted Express to Stansted Airport. I am a visitor to London and I was under the impression that Stansted Airport was within the London travel network due to its name "London Stansted Airport". I work in the legal profession and I would never intentionally attempt to evade a fare. The first two appeals were rejected with template responses stating that the contactless payment restriction is clearly signposted. My third appeal, based on the template kindly provided by the user @scm (https://www.railforums.co.uk/threads/stansted-airport-fines.253779/page-3#post-6451904), asserted that Liverpool Street station does not contain the appropriate notice regarding the contactless payment restriction and I provided photographs to evidence this. My third appeal has now been rejected and the rejection did not provide any specific reason, merely stating that a panel of three members approved by Transport Focus and London TravelWatch had fully considered the appeal. I would be grateful for any advice on what to do next.