This is an important church, built in 1850 for the rector, Henry Manning, by William Butterfield. Manning preached his last sermon here before converting to the Roman Catholic church, where he rose to become Archbishop of Westminster and a cardinal.
Butterfield was working at the time on his masterpiece, All Saints Margaret Street in London, but here he uses the local Sussex style but in a typically forthright way.
Unfortunately, the church was made redundant in 2008 and access is no longer possible, apparently on safety grounds.