His family has launched a website, LookyMartin.com, which tells readers a bit more about Lucas, and has links to charities including Meningitis Now, and Organ Donation IOM.
They're asking people to "give it LOADS" in his memory - to move through life with more Love, Optimism, Ambition, Determination and Selflessness - saying that's how Lucas conducted himself through his 21 years.