I am currently listening to a double album I have of theirs, no producer is credited at all.
Any ideas?

The production is throw away and yet thoughtful.
I have an EMI single of theirs and it says "a Paper Lace Production".
Were they self produced all the time?
I`ve met them , but did not ask the recording questions.

I have no idea Mart.

However, I do recall a moment when I was a wee lad and this rusty van pulled up and the bearded driver asked me directions to the local Working Men's Club. I told him where to go (politely and accurately of course) and thought no more about it until I saw this same guy a couple of weeks later on TOTP. I realised I had given directions to Paper Lace.

Oddly enough, much more recently I was walking along a street and happened to notice this very attractive young lady who looked totally out of place. I watched her get into a car and drive off, then I wandered into WH Smith to look at the CDs, to see her again on the cover of her new release - Avril Lavigne. She was in the UK to promote her debut single.

The last time I saw Paper Lace was at a 70s nostalgia show, and they only had one original member (chris Morris, I think).

Were they not produced by Peter Callendar and released on his Bus Stop Records?

My records are on Contour and Old Gold.
Very informationless.

But isn`t "The Night Chicago Died" a cracker?

It was Peter Callendar and Mitch Murray according to my 7" copy of Billy, Don't Be A Hero!

The answer may be... Mitch Murray and Peter Callender.

From Wikipedia

"Thanks to that show [Opportunity Knocks], songwriters/producers, Mitch Murray and Peter Callender quickly signed them."

Cheers for that guys.
I mimicked a recent production on their recordings.
The way the instruments are used are very lyrical and fit the stories that are being sung perfectly.

At the risk of saying they don`t make them like that anymore, they simply don`t.

Mart, I totally agree with you about 'The Night Chicago Died'. I still dig that one out now and then. A classic.