In Reading's case at least because there has been a significant Polish presence here since the Second World War. The Polish military personnel couldn't go back home as Stalin would have murdered or deported them, they made their new homes close to where they had been stationed. A Catholic Church in Watlington Street was handed to the Polish community in the 1950s and the noticeboard was written in Polish. Quite fascinating for a schoolboy whose school was not far away.
The Watlington St Church provides one of the four distinctive church spires visible on the South side from the train at Reading. It was built in 1873 as the Anglican parish church of St John the Evangelist. It was threatened by Reading's slum clearance and by a planned dual carriageway through its site, so the CofE decided to move to the site of its new school, across the A4. The slums then became a conservation area and the road scheme was forgotten! The church closed in 1978 and after a big conservation battle (including Marcus Binney and SAVE) was sold quite cheaply to the Polish Catholic Mission in London Road, reopening in 1981. It wasn't that the CofE didn't like Catholics - they're all good chums now - it was that the fashion was against things Victorian. "A stinking shrine to Victorian Capitalism", " one of the worst church interiors in Reading" were clerical quotes at the time. It recently had a c£1m EH grant to re-point in lime in place of the cement that was causing severe frost damage and so now looks really smart. The Polish influx of recent years has not been as noticeable in the pews, it seems, with many of these youngsters associating their traditions with their poverty.
The other three spires are those of St Giles, Christchurch and Wesley (Methodist) There are various other pinnacles and bellcotes on the skyline, now being joined by tower blocks.
Not quite Luton Airport but hope the tale is of interest.
OTC