"What do you think o' that one?" asked the inspector of the sergeant when Pender had stumbled out of the station.
"Up the pole an' 'alf-way round the flag, if you ask me," replied his subordinate. "Got one o' them ideez fix what they talk about."
"H'm!" replied the inspector. "Well, we've got his name and address. Better make a note of 'em. He might turn up again. Poisoning people so as they die in their baths, eh? That's a pretty good 'un. Wonderful how these barmy ones thinks it all out, isn't it?"
I can't figure out the above bold part of the sentence, which is from "The Man Who Knew How" by Dorothy L. Sayers.
Sounds like the policemen regarded the guy (protagonist in the story) as a gaga.
But I am not sure about the exact meaning of 'up the pole and half way round the flag' and 'got one of them ideez fix what they talk about'.