Started watching Our friends in the North. All the men have the amount of hair directly inverse to their current amount of hair. Eccleston and Craig have a fair bit of hair. David Bradley has quite short hair. Mark Strong has The Most hair.
(Also it feels very stagey and stiff, more like something made in the sixties or seventies, not the nineties. Noticeably less naturalistic than, say, Boys from the blackstuff or The Beiderbecke affair, both of which were the eighties. Maybe it's deliberately scripted and acted and shot like television from the period it's set in? I'll have to see whether the style changes in later episodes.)