Can vouchers be got for Club Lounge in Gatwick?

Is there anyway passes / vouchers can be got for WT passangers?

Nope, only way in for WT pax is as a guest of J or F pax or Au/Ag card holder. Best thing is to look on here and see if anyone is traveling who can guest you in.

Jag - there are 9 of us in club but 2 of our friends are in WT - So rather than splitting up we would like to try get them into the lounge beforehand -

With 9 in CW I am sure you will be able to get 2 guests in with you just ask the dragon nicely.