Not sure if related but I was at a friend's house yesterday and my laptop simply refused to see the SSID they had on the paperwork provided by Virgin. We needed to get access to something online so she got her son's laptop out and similarly it couldn't see her network despite working before. My phone and hers could but neither laptop. My initial reaction was that she was only broadcasting a 5ghz signal and both laptops were only compatible with 2.4ghz but I wasn't going to go poking around her router's configs so just used an ethernet cable. Maybe Virgin have pushed out an update to certain routers that have disabled the 2.4ghz network? You'd have to connect via cable then log in to the router and have a look.