With the engineering job market as it is (insufficient people for the jobs being offered, driving salaries up), I would lump it for the higher salary, as to be honest you won't save much at all in despatch - and you will be a graduate arguably wasting skill to some extent.
Racal/Smiths - speak to Royal Aeronautical Society careers department for advice - you might find things you much prefer even within engineering.
Otherwise - accountant to engineering firms/auditor/consultant - what class of degree do you expect to achieve?