All the Sibton Listed Buildings are shown here including two Grade I's
http://www.britishlistedbuildings.co.uk/england/suffolk/sibton
I passed through Sibton yesterday but didn't stop as I was running late but here is an interesting read from many years ago
http://blything.wikispaces.com/%28sib%29+Community+perspective
Members of the Clayton family from nearby Sibton Park in a tablet memorial in St Peter's Church in Yoxford, John Clayton was a High Sherriff of Suffolk in 1796