ANALYSIS: Do new engines and a Crossback improve PSA's DS4?

The DS4, as you'll see from older ones sporting the deux chevrons, was originally launched in 2011 as a Citroen with DSign, DStyle and DSport trim levels and a range of petrol engines (VTi120, THP155, THP200) and diesels (HDi 110 and HDi 160) with a mix of five and six-speed manuals and an automated six-speed manual. At the end of 2014, the delightful new, three cylinder, 1.2-litre PureTech 130 engine was introduced and plans were announced for DS - also now wrapping up the DS3 and DS5 - to beco