We check for Myles Allen in Wikipedia with the search myles allen wikipedia. There's a substantial chance he won't be in Wikipedia even if he is an expert, but it's a good first step to check there.
In this case, we luck out! He's in there:
Look at the Wikipedia article and then look (skim, really) his opinion piece. Does he have relevant expertise? Double check the answer in your fact-checking notebook and write down your assessment of the writer's expertise.
Next up: Smoke-free (prompt)