Sadly, this afternoon’s Randall & Hopkirk was among the few that disappointed me. The plot was breathtakingly obvious – even our son figured out that there were fewer actors than characters – and they didn’t do nearly enough with the new characters in the story. Shaun Parkes, who we saw last month in the Doctor Who two-parter “The Impossible Planet,” and Colin McFarlane, who also did a Who two-parter we haven’t got to yet, play Charley Marshall and Sebastian Snellgrove, a pair of detectives in the same building as Jeff and Jeannie. They look like they’re living large and doing very well – Snellgrove wears expensive clothes and drives a Rolls – but they’re every bit as downmarket as any other PIs. Snellgrove just calls all their expenses “tax deductions,” driving his poor partner, who’s trying to pay the bills, to despair. They all get hired on the same case by two different clients, but the only real mystery is when in the adventure Snellgrove’s going to become deceased.