Oh, there's an interesting sight - new to me, but clearly an adaptation of the Perdio PR100
http://www.forum.radios-tv.co.uk/vie...php?f=3&t=6588
just as the Shorrock Mk V
https://www.radiomuseum.org/images/r..._v_1973258.jpg
was a modified Decca TP85
https://www.radiomuseum.org/r/decca_tp85tp_8.html .
(A bit off-topic, that, but helpful I hope as the Perdio model seems not to have been identified before as the Clubman's begetter).
As Paul has said, this set looks reasonably presentable already. I've not had a PR100 - there aren't that many around - and would hesitate to advise on further cleaning without knowing the particular covering: some can all too easily drift toward becoming a mess of tangled threads if soaked a little too long and/or scrubbed at a mite too vigorously, and that surface texture doesn't appear especially resilient.