British English Idioms

Penguin

The Penguin Dictionary of English Idioms: 5000 Idioms

Langley Press

Fancy A Cuppa? British Slang 101: The Hilarious Guide to British Slang (Includes Must-Know Swear Words, Funny Expressions & Cockney Rhyming Slang)

CreateSpace Independent Publishing Platform

101 Very English Idioms: Learn to Speak like a True Brit

Oxford University Press

Oxford Dictionary of Idioms                      

Best British Idioms – 250 Classic British English Idioms (English Edition)

Independently published

English Idioms – Illustrated Dictionary of British Idioms, Phrases & Expressions

Cambridge University Press

Cambridge Idioms Dictionary                      

SUSSIDI LINGUISTICI

Idioms: A Practical Guide to Common Idioms from British and American English

Independently published

American English VS British English: Differences between these two accents include pronunciation, grammar, vocabulary (lexis), spelling, punctuation, idioms, and formatting of dates and numbers.

Farlex International

The Farlex Idioms and Slang Dictionary: The Most Complete Collection of Idioms and Slang in the English Language (English Edition)