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Beyond (great) expectations!.
When he hesitantly made to blow the whistle I thought for a split second – ‘M.R James tribute? Nah’…. But Mrs MR looked at me at the same time, obviously thinking the same (‘Whistle and I’ll Come To You’ is a family favourite antiquarian/ghost-story/film). We both looked back at the TV and there it was. We high-fived and we felt cheesy. But also not.
Just a great and perfect reference with more respect than humour and just the right amount of both. This is the best TV series IMO. Perfect.