Not my taste - looked like a nice clean rare White Blob without them from your avatar.
Might be one of these that looks better in the flesh than it does in the pictures though.
I don't have this problem (yet) so cannot vouch whether it works or not. I don't think dougieboy would have much to lose by trying the first option of just spraying with WD40 lithium grease though and like I said would only be a temporary measure until he can get funds to get them replaced. Might just stop that annoying knock though.
I know some guys have done this and run them for 6 months or more without the knock returning.
For a quick fix you can always try this:-
http://www.scoobypedia.co.uk/index.php/Knowledge/KnockingNewageRearStruts
Might tide you over until you can get the Coilovers buddy.
Mines fitted today for £20
What a difference over the standard twin pipe, really does burble nice now and
I'm sure it feels like it's picking up better low down
This sounds the exact reason why I'd rather get a fast fit place to do it.
They've got all the bits and pieces to hand if required.
Even at £20 or £30 fitted must be worth saving the hassle?
Good luck mate
I phoned a few local exhaust places today, only one that responded positively was National Tyres so will try them tomorrow morning. Mines is a Prodrive so should be straight forward for these guys I would have thought.