Humphrey Lyttleton died suddenly earlier this year. He was a very famous jazz musician and, late in his career (!) in the 1970's started hosting a ridiculous show on the radio called "I'm Sorry I Haven't A Clue" which is a lot like 'Never Mind The Buzzcocks", (chairman, panellists, questions which only really serve as excuses for humour from the panel, etc etc).
The show was introduced as "the antidote to panel games", because although it seems like a panel game, and there are frequent mentions of points, prizes, etc etc, in fact none are awarded: The whole show is Humph giving comedians silly things to do. These include Mornington Cresent (had the boat been a different colour it could have been called that), One Song To The Tune Of Another (imagine "I've got a lovely bunch of coconuts" to the tune of "There'll be a welcome in the hillside" and you get the idea).
Humph made the show as he was able to get really really fruity double entendre across in an innocent-seeming way (at 6.30pm on Radio 4). Now Humph is gone it seems unlikely that the show can continue.
The boat's name is our own tiny homage to Humph. He has been part of our lives (on and off) for decades.
http://en.wikipedia.org/wiki/I'm_Sorry_I_Haven't_A_Clue