BBC4's The Beauty of Maps ended on a high last Thursday night, with part 4 focusing upon political cartoon maps of the 19th century and since. Everyone will be familiar with political illustrations that incorporate maps, but it was good to be able to chart their beginnings through the octopus maps of Fred Rose, through to that horrifying yet utterly mesmerising Churchillian octopus map of 1944. Ouch. Not pulling any punches that one - but the lesson is surely that if you dish it out (as Rose's octopus did) you should also be able to take a few.

What always strikes me about these cartoon maps or 'serio-comic' maps is the wonderfully modelled, coloured and complex imagery, which seems to leap out of the page at you. They were designed specifically to be noticed, and through being noticed, their political messages found their way into people's minds.

To be honest, half an hour didn't seem like quite enough time to feature everything. Last night's programme wasn't able to look at, for example, the far earlier 16th-century maps which show continents as animals, and we didn't get a glimpse of the extraordinary map cartoons of Lilian Lancaster:

Nevertheless, the series was a triumph, with almost half a million people watching the first episode. I'd like to congratulate Stephen Clarke the director, and all of the British Library staff who made it possible. Of course, nothing would have been possible without the British Library collection to draw upon, and I should point out that nearly all of the maps featured will be included in the Magnificent Maps exhibition, the opening of which is almost, very nearly upon us...