This is the Church Micro for Arbury Road Baptist Church in Cambridge. There are about seven other Baptist churches in Cambridge, but none have geocaches, hence the rather ambiguous title. It's also not a Micro, but you're not allowed to complain about that.
Arbury Road Baptist Church was founded as Ebenezer Baptist Church in 1848, a plant from St Andrew's St Baptist. It moved to its present site in 1930 at about the time this part of Cambridge started being developed, but the present building dates from 1966. It is a pleasant but not particularly notable example of church architecture of that period.
The cache is a small clip lock located alongside the church grounds. While finding it, you might like to look at the neighbouring building, Limehouse, an interesting modern design from about 2006.