Hi we are going through exactly the same, though my husband is a HGV driver. He has been with his employers for over 10 years and could not successfully perform his job without a large amount of overtime. His overtime is in excess of £350 a week but they are asking his employers to guarantee £200. No employer is going to guarantee overtime, even in the good old days.
His employer is a huge manufacturing company and even in these turbulent times are recruiting staff and expanding the factory.
From the first day of applying for the mortgage he supplied Halifax with wage slips that clearly displayed his overtime, but no-one ever mentioned that they may only pay 60% LTV on his overtime. His income has never changed since they issued the mortgage promise. This has now been going on since the begining of March. First they said everything was fine then a week later asked for 3 months bank statements and wage slips. Our Halifax mortgage advisor the told us we had the mortgage they were just cross referencing the wage slips but she had already done so, so it was fine. She didn't contact us whe she should of, we knew something was up, when my husband called her she told hime "they've asked for this employers reference". We were fuming as my husband closed a savings account to withdraw our deposit, she's cost us money.
I have written a forwarding letter to our mortgage advisor to be sent to the underwriters at the sametime as his employers reference stating that my husband has over 3 years of wage slips with overtime stated and 10 years of P60's if they want them. Also stated he couldn't be a HGV driver for his employers unless he worked mostly during the overtime hours, the pure nature of his job ensures this.
Can you please let me know how you got on, if you were successfull or not? As we will not be able to purchase the house we have our heart set on if they do not allow 100% on his overtime. These mortgage promises are useless and I think our Halifax mortgage advisor is useless. The house we have put a offer sold in Dec 06 new build for £179.999 and they have accepted our offer of £125k so you can see its a bargain.
Your result may help me have a nights sleep, one way or the other, just dont expect to get an answer for 3-4 days.