I dont really know about Spike Milligan, have only seen his stuff from when he was getting on a bit.
I thought taking the piss out of Prince Charlie was great, but then i felt a bit cheated when i found out that they were in fact friends - but that's my own fault for being an idiot.
Also i remember him accepting some sort of award, and i couldn't work out whether he actually had alzheimers or something, or whether he was acting.