Apple has hardly been a frontrunner in the mobile world’s gallop towards artificial intelligence (AI), but it made an attempt to catch up on the first day of its WWDC developer conference. Siri, its voice-activated digital assistant, will sit at the heart of new services driven by AI, and will expand well beyond its current place in the iPhone, into the home, car and anywhere else Apple fans may want to connect. Though Siri was a highlight – and has been a technology where Apple, unusually, has blazed a trail rather than following – there was still a sense of ‘too little too late’. Siri was ahead of the game in smartphone virtual assistants, but Apple failed to build on…