I finaly recieved my Vox 847 at work this morning after almost a month of waiting. I got it on ebay with a buy it now of $69 USD, it came to $91 CAD to the door. I could not wait to mod the thing, so before even trying it, I drove over to Ted's (Guitarpartscanada.com) and got a 3PDT switch like this one:
http://www.stewmac.com/freeinfo/I-1561.html
and performed the true bypass mod....I can't say it sounds better than before because I didn't even try it before doing it

Ted was very helpfull in showing me how to use the switch and knows his stuff.
The wah sounds great, It's a little honky but I will try some voicing mods, and a led, thanx to the switch Ted suggested. maybe also the volume pedal mod in the off position.
I think I got a great deal the pedal is new and still had the plastic film on it, the only thing that may have been the reason the guy sold it is because the pedal would not stay in position, it just fell to full treble position. I just tightened the friction strap and it's all good.
I will post mods as I complete them, and give my opinion on them.
Mods are here:
http://homepage.ntlworld.com/s.castledine/greenfuz/wah.html
pic of pedal with 3PDT switch: