In case anyone else has the same problem it turns out that you can add video modes to the intel driver before you install it by editing the config file (this is not my idea I just googled it) It seems much more like a thing that typical Linux users might do than typical Vista users; but never mind here you go:-
Uninstall the driver so you are back in VGA mode.
Edit the Kit17065 file in the graphics folder using notepad.
Find the [NonEDIDMode section
Replace the contents with this:-
HKR,, TotalDTDCount, %REG_DWORD%, 1
; This shows number of DTDs to be used.
; 0-->Disable the feature.;Following keys have 20 bytes (18 byte DTD + 2 Byte flags).
HKR,, DTD_1,%REG_BINARY%, 97,29,A0,D0,51,84,20,30,50,98,3,00,00,00,00,00,00,1C,27,00 ;1440x900@60...Progressive
Save the file; reinstall the Intel driver; reboot and you can set your mode to 1440x900
Google [NonEDIDMode_AddSwSettings] if you want to thank the original people who described how to do this.
This works and is tested on my SyncMaster 923nw.