Aintree

British censorship was mainly based in Aintree (near Liverpool)
with nearly 20 other censor stations around the country.
—Wikipedia: "Postal censorship"

She sits in Aintree, far from the Front,
At her tinny metal desk
And works for Country, King, and God.

Each soldier's letter, read with care,
With pencil is precisely cut,
To leave it very little blood.

Redacted, sterilised, it's sent
On to the soldier's love at home
Who's moved by words that have been left,

Like "a" and "an" and "the."