I have a question regarding employment gap for applying ILR.
I had been on WP since 3/07 but was unfortunately

I switched to Tier 1 general visa on the 12/08/09. So there is not gap
on my visa.
I now get a job offer

I now have two concerns:
1) How to calculate employment gap? Is it from my date of redundancy (23/06/09) or the end date of my garden leave (23/08/09)?
2) What's the maximum employment gap allowed for ILR application, if allowed at all?
Appreciate your help !