* 90 day concession (page22):
https://www.gov.uk/government/uploads/s ... eriods.pdf
The entry clearance stamp date is counted as the date of the start of the 5 year lawful residence not the Entry date in the UK itself, under the condition that the Tier 1 G migrant enter within 90 days of the EC.
28 days - Please do not send us your application more than 28 days before you become eligible to apply. If you do, we may refuse your application with no refund of the application fee (if a fee is charged for your application type). However, you must make your application before your current permission to stay in the UK expires.
So your 1st entry into UK is within 90 days concession time so your continuous period of ILR will began from stamp of your 1st visa date which is 14th May 2010 to 14th May 2015
So when apply 2nd rule which is 28 days before to completing 5 years the dates will be 28 days before to 14th May
which is 17th April