So as requested. We arrived at Barajas at 16.05. We went directly through to VIP Secirity and was through very quickly. We went to the shuttle via the lift (thanks CWS). The train took what seemed like a long time to get to 4S. We went up in the lift and arrived before all others on the escalators. There was no queue whatsoever and loads of machines were open. No problem at all!