From the Stewards' Room on the BHA site:
The Stewards held an enquiry under Rule (B) 11.6 into possible interference inside the final furlong. They found that the winner HIGHLAND CASTLE, ridden by Jamie Spencer, had interfered with SWIFT ALHAARTH (IRE), ridden by Silvestre De Sousa, placed second. They considered that the interference was accidental and had not improved HIGHLAND CASTLE’s placing. They ordered the placings to remain unaltered.
The Stewards held an enquiry into possible interference approaching the one furlong marker. They found that the winner HIGHLAND CASTLE, ridden by Jamie Spencer, had interfered with REFLECT (IRE), ridden by Eddie Ahern, placed third. They considered that the interference was accidental under Rule (B) 55.
Yet he did not even attempt to switch his whip despite it being in the wrong hand throughout.