Just read through this whole thread, I really hope you managed to get to the vets, from what you've said it probably is VHD, especially if they're not vaccinated against it. Can I ask why you didnt get it done? Its just when I had Kovu vaccinated I didnt have the option of 1 or the other, it was both!
R.I.P Basil, I know how much he meant to you!