The Black Horse in Market Bosworth is good. The Black Horse Restaurant in Market Bosworth
Also, just down the road from The Royal Arms is The Hercules. Also good, but there's no traditional Sunday Lunch as far as I know. Hercules Revived, English Country Coaching Inn, Sutton Cheney, Leicestershire
Or The Royal Red Gate on the A5/A444 junction. Menu | Nuneaton - The Royal Redgate Country Pub & Restaurant (theredgate.co.uk)
If I were to choose personally, I'd go Black Horse. Always been top for service, atmosphere, food and location.