Apologies for yet another post (I'll make sure its my last one for tonight), but I've done some digging regarding buses with WiFi:

Ones that I am certain of are 392/4, 790/1/2/3 and I think that's just about it. I haven't been able to find any evidence to suggest that 393 and 395 have WiFi or not, but it would be somewhat logical to think that they do given 392/4 have received it.

804 - 815 are fitted with tables, but that isn't a feature included on this site's fleet lists.