The relevant Guidelines say:

A potential conflict of interest arises when there is the possibility that an individual’s external activities or interests may affect, or be reasonably perceived as affecting, the BBC’s impartiality and its integrity, or risk damaging the BBC’s reputation generally or the value of the BBC brand. 

And, with reference to outside work involving on air talent, they explain that:

Advertisements or promotions involving talent should not imitate, suggest a reference or connection to or ‘pass off’ BBC content, for example, by replicating any editorial elements of a programme, such as characters, logos, titles, channel names or music or graphics associated with the programme, or by using or directly imitating sets or key venues, catchphrases or format points from the content.

Nothing emerged from the ECU’s enquiries which suggested that Mr Hunt’s work for Aintree.co.uk might reasonably be perceived as affecting the BBC’s impartiality or integrity or putting the BBC’s reputation or the value of its brand at risk, and the complaint was not upheld in that respect.   However, BBC Sport accepted that his appearance wearing the BBC Sport logo in  the tweet complained of had the potential to suggest BBC endorsement of a commercial product, and the ECU judged that it did not conform to the relevant Guideline.  As the material in question had subsequently been removed from the website and, independently of its enquiries, the management of BBC Sport had discussed the issue with Mr Hunt, the ECU considered sufficient steps had been taken to resolve the issue of complaint.

Resolved