Thanks Ian, I'd wrote to them last night so awaiting their response. Itchy feet ME, wants to call them right now but I'm not getting any work done being on here LOLL.
You're absolutely right actually, replacing 1 shock is really not the done thing but what are the implications IF I did only chose to buy the one for now (since price IS a factor).
Now: E92 335D
Gone But Not Forgotten: E90 320D Alpine White