This pocket Italian grammar was first published under the BBC imprint in the mid-1990s, but I own it in its North American edition put out by NTC as "NTC's Italian Grammar". It describes such basic things as formation of the plural, verb tenses and moods, the definite article and its prepositional compounds, etc. At the end of the book the complete paradigms of 31 irregular verbs can be found. I am a linguist and prone to using specialist terminology in a review, but the author of this grammar presents the information in plain language accessible to all.
At 192 pages, it only sketches Italian grammar. It is enough to get one through "Teach Yourself Italian" (another NTC publication of the time) or a similar beginner-intermediate course. Its limitations eventually become apparent and a student should invest in a more ample reference grammar, but the great advantage of this book is that it is truly pocket sized, so it can accompany one to lessons and looking anything up is fast.