The Hacketts’ holiday woes only get worse as Neil’s desperate mission to hold his own alongside Robert finds both families tackling a very taxing climb up Helvellyn.

While Robert swears by his high-tech GPS, Neil relies on maps and misplaced confidence to navigate the peak.

But as prickly Penny rather foolishly follows Neil, they are soon stranded together… Meanwhile, when long-suffering Fiona finds her way home safely, thanks to Robert, she’s confronted by Neil’s brassy, leopard-print-clad mother Mercy (played with gusto by musical theatre star Elaine Paige), who has paid an unexpected visit and has taken a shine to fellow holidaymaker Fieldhouse (Only Fools and Horses’ Paul Barber)!