kns, has your employer told the UK Border Agency about your salary increases? I would have thought they would at least have been a "technical change of employment".
I have heard of some people having no problem in getting ILR despite quite substantial increases in salary, but technically you only have permission to work in the UK under the terms of your visa: what salary is stated on your visa letter? Your application for ILR could be refused on the general ground of breaching your previous conditions of leave.
The Work Permit guidance is that a "technical change of employment" (which must be notified to UKBA) does not include normal annual salary increases given to all staff. However, a substantial salary change could amount to a change of employment, requiring the employer to readvertise and issue a new work permit (or rather, a CoS under the new system).
The Work Permit guidance on Technical Changes of Employment is here:
http://www.ukba.homeoffice.gov.uk/sitec ... iew=Binary
The guidance on Changes of Employment is here:
http://www.ukba.homeoffice.gov.uk/sitec ... iew=Binary
I hope others will add their opinions to this because there doesn't seem to be a "right answer", especially for people who have had salary rises but no changes in job description.