Me and my girlfriend had lunch at this inn last February while driving by during our visit to the Cotswolds. We were very impressed by the quality and the quantity of the food, which was served to us by the loveliest of waitresses (Becky). Prices on the menu aren't really cheap, but trust me the food is worth. We also visited their accommodation. Overall the room showed to us was very reasonable for the price quoted, but did not stay since we had already booked elsewhere.
We will return surely, to stay overnight and sample also dinner and breakfast, but so far so good. A big thumb up for the Merrymouth Inn.