Although formal confirmation has yet to come, all the signs are there that Comcast’s European operation Sky will invest in a wholesale fiber network being planned for the UK by a new company set up by previously-archrival Liberty Global, as revealed last week. We revisit this nascent story now as it has several subplots revolving around the fact that the UK (plus Ireland) is the one region where Comcast and Liberty Global are head to head as the two dominant pay TV operators, having acquired respectively Sky and Virgin Media at different times for large sums. Comcast’s $39 billion acquisition of Sky was one of the mega media deals of 2018, while Liberty Global raised eyebrows in 2013 when it…