I thought it failed for several reasons.
1.I tried to hard,and so became po faced and not enjoyable.
2.It was asking a lot to condense it into an hour and a half.
3.There have already been 3(?) film versions,what did the producers hope to achieve by doing another one?
4.The direction was incredibly poor.There was no tension at all, and it just ambled a long.
Oddly enough there were several(possible) continuity errors,where did Hannays suitcase that he stole in the club go to,it wasnt at the station.
Where did he get the lamp he had in the barn from?
How did the spies know where he was,when he was on the Highland road(radar?LOL)
If someone rolled down a Highland hillside into the path of your car (in the middle of nowhere) why would you assume they were the Liberal Candidate?
I get the distinct feeling that this might have been "cut down" from a longer (say 3 hour) or two part production, a lot of things in it didn't make sense.
I must say I have never read the original book,so now am totally confused as to which version follows it,and which version uses the original ending too?
I know the Hitchcock one updates it,and maybe the Robert Powell one is set in the correct(?) period,but apart from that I am in the dark.