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Christ Church was consecrated by Joseph Allen, Bishop of Ely, on 27 June 1839. It had been built at a cost of £3,800.
Christ Church stands in the parish of St Andrew the Less. St Andrew's Church, known today as the Abbey Church, was closed for public worship by the time Christ Church was built. For this reason Christ Church was used as the parish church and in January 1846 the arrangement was formalized legally. The interior of Christ Church is 58 feet wide, 87 feet long, and at 44 feet high. Rather than the usual east–west orientation, Christ Church faces south. Stained glass was fitted in 1885.
Grade II listed. Link

Listed buildings and structures are officially designated as being of special architectural, historical or cultural significance. There are over half a million listed structures in the United Kingdom, covered by around 375,000 listings.
Listed status is more commonly associated with buildings or groups of buildings, however it can cover many other structures, including bridges, headstones, steps, ponds, monuments, walls, phone boxes, wrecks, parks, and heritage sites, and in more recent times a road crossing (Abbey Road) and graffiti art (Banksy 'Spy-booth') have been included.

In England and Wales there are three main listing designations;
Grade I (2.5%) - exceptional interest, sometimes considered to be internationally important.
Grade II* (5.5%) - particularly important buildings of more than special interest.
Grade II (92%) - nationally important and of special interest.

There are also locally listed structures (at the discretion of local authorities) using A, B and C designations.

In Scotland three classifications are also used but the criteria are different. There are around 47,500 Listed buildings.
Category A (8%)- generally equivalent to Grade I and II* in England and Wales
Category B (51%)- this appears generally to cover the ground of Grade II, recognising national importance.
Category C (41%)- buildings of local importance, probably with some overlap with English Grade II.

In Northern Ireland the criteria are similar to Scotland, but the classifications are:
Grade A (2.3%)
Grade B+ (4.7%)
Grade B (93%)

Read more at Wikipedia Link