So, you're just looking at UK incidents, whether or not an engine is involved. How very blinkered that seems considering this is a twin engine discussion thread. (The last horrible crash, your phrase, was in fact the Seattle 350)
Ok, if you want to play it that way, may I suggest you visit the UK AAIB publications webpage
Air Accidents Investigation: Publications & Search Reports ... select the radio buttons to search the rotary only reports, leave the dates as 'any', press 'search' and you'll notice that of the 940 reports, the vast, vast, vast majority are single engined rotorcraft.