Unless you can see a consolidated financial statement covering the whole of the football business then these accounts tell you very little. The exemptions mean that there isn't even a proper Directors' Report describing the activities of the company which might have told you how the income was derived.
I suppose it's possible that a professional football club with an average attendance of 18,000 20-odd times a year is paying only £130,000 to rent a 32,000 seat stadium but it looks a touch on the low side to me
Ignore these accounts in isolation - they are meaningless without further context.
On the subject of administrative expenses being "legal and above board" you are making the schoolboy error of conflating "legality" of expense with allowability against tax. If the company spent the money then it spent the money - even if the expenditure was illegal (eg bribes) it would still go into the accounts. Whether the taxman accepts them as expenditure genuinely made in pursuit of the company's stated aims is another matter.
If you look at the tax note (note 9, page 11) you will see that £357,546 of expenditure has been disallowed for tax (ie you can't use it to offset taxable profit or increase taxable losses). It's possible that they were bribes but much more likely is that within this figure is some entertaining expenditure, but the bulk of it will relate to aspects of the related party transactions detailed in note 18, page 16).
