Every quarter, when a new Liberty Global financial filing lands, we digest the latest unimpressive results of its video business and ponder which territory the once mighty European operator might choose to vacate next. With just Belgium, Switzerland, Ireland and Slovakia remaining – excluding the UK and Dutch joint ventures of Virgin Media O2 and VodafoneZiggo – it is fast running out of options. UPC Poland is the latest arm to be severed by Liberty Global, in a $1.8 billion deal with French telco Iliad, where it has given up on 1.4 million pay TV subscribers – in a market which has been one of Liberty’s strongest performers in recent years. The sale of UPC Poland speaks volumes about the…