However......LO will now sleep for 2 hours in the morning at say 11am but then is refusing afternoon nap - so i assume this is the 2-1 transition that you mention?
This is great, and if your LO can cope with it over a period of time - and not get too OT from the long A times then you may find he is ready for 1 nap. You will likely find that he cant quite last the arvo so I would maybe see if something like this would work (With your usual WU time)
WU 6.30
Nap 11-1
CN 5-5.30
BT 7.30
If you want to try for 1 nap days then your day may look more like this on those days
WU 6.30
Nap 11-1 or later (preferably 1.30)
BT 6pm so early BT with the hope your LO will tack onto his nights. Some do, some dont

What's the average wake time for a 12 month old?
It varies so much but we are on 1 nap at 12 months with an A time of 4.5hrs and 3hr long nap. Some LOs can only cope with 4hrs, others are up to 5.
You can do the 2 nap thing with 2 shorter naps. However you may find it gets tough as he gets closer to 1 nap as you want to move towards one long nap over lunch. Capping both naps makes it hard to do the move to 1 nap IYKWIM?
There is a support thread for the 2-1 transition too. I found this thread really helpful and I could chat with others going through it. YOu just join on in
http://babywhispererforums.com/index.php?topic=226104.0