Hi Andy
You probably wont benefit for the first 2 miles as the car will still be warming up, meaning the engine will warm up before the hybrid kicks in. By that time your wife will be at work.
The hybrid is more beneficial around town than long runs.
Another option is a 2.4 or 3.0 with LPG, even though the car still needs to warm up for 2 mins before LPG kicks in, when it does your fuel costs will be roughly 40% less. initial investment of LPG is approx £1200, however this will add slightly more value to the car and easier to sell later. LPG will benefit 100% of the time whereas hybrid was designed for city driving.