Lovejet - I don't think there is sufficient information in MAG's accounts for you to judge the split of property and non-property income at BOH. Certainly the analysis on page p11 specifically excludes property income.
You also need to consider that the property income from BOH in the divisional analysis on p17, the property income from BOH is reported as part of the 'Manchester Airport Developments' divisional result.
If you got a copy of Bournemouth's own accounts you'd see a significantly higher income than is reported here - I assume that the difference is the business park.
On that basis the park generates significantly more profit than the airport does.