Indeed......there you go, wait a week and everything looks better!
Went to tip my ruined mild down the sink, but decided to give it one more try. After all, it has only been in the keg for 4 weeks, it should be in top condition.
And, Lo!, it came to pass that apart from the odd lump of flocculated yeast, the bloody thing is clear. Its darkish, so you can't see through it like my last effort, but you can definitely see the prints on the other side of the glass.
And it's started to taste a bit sweet too....just as I designed it.
Mr S. is snoring softly on the bed next door, blissfully aware of eventually having a beer named after him. Feline Philistine!