Langley, also known as Langley Marish, is an area of Slough in Berkshire, England. It is two miles east of Slough town centre and 18 miles west of Charing Cross in Central London. It was a separate civil parish and village until the 1930s, when the built-up part of Langley was incorporated into Slough. Langley was in the historic county of Buckinghamshire, bein…Langley, also known as Langley Marish, is an area of Slough in Berkshire, England. It is two miles east of Slough town centre and 18 miles west of Charing Cross in Central London. It was a separate civil parish and village until the 1930s, when the built-up part of Langley was incorporated into Slough. Langley was in the historic county of Buckinghamshire, being transferred to the administrative county of Berkshire in 1974.