Hello Conway, we've chatted before I think. Well done for making a very big decision and acting on it. I know it's hard but you're doing the right thing.
Nobody needs to wait two years. Everyone, and I mean everyone, can divorce on the grounds of Unreasonable Behaviour - and most people are advised to as it's the quickest and cheapest option. Most people cannot believe the reasons I'm being divorced for, let alone the fact that I'm not divorcing him!
The only way you can 'contest' a divorce is to spend a lot of money on solicitors and barristers to argue it before a judge, who will rule that the divorce can proceed.
The only exceptions are very very extreme. The example my solicitor gave me was of a woman whose husband set fire to her in her own kitchen and then attempted to divorce her on the grounds of her UB. It was upheld that nobody can act so unreasonably that they deserve to be set fire to. She divorced him on the grounds of his UB.
So practically speaking - he's been served papers. It doesn't matter that he's in denial. And the courts don't give a damn that he doesn't sign the acknowledgement of service that he's received it in seven days (I sat on mine for for six weeks). If you want to proceed within seven days follow the advice given here:
www.wikivorce.com/divorce/DIY-Divorce-Resources/Petitioning-for-Divorce/How-can-i-have-a-divorce-if-the-respondent-will-not-sign-or-i-dont-know-where-they-live.html
If not, give him a little more time to adjust - but that absolutely has to be your choice.
Take care - it's a horrible experience, but it will get better.