Hi Ashleigh - when we visited in the summer it was 7.30 to 9.45 am but I would suggest as others have said, that a phone call to the hotel would confirm if that has been amended or not.
PS the breakfasts are very nice.
I wpould suggest that Ashleigh contacts the hotel direct.
I think they serve breakfast until 9.30, maybe a bit later at the weekend, but I can't remember exact times. Suggest a call to the hotel if breakfast times are crucial to your visit
Get an answer from Corbyn Head Hotel staff and past guests.