Open exactly one email. Don’t bother reading it; That would put you into overtime. But you can at least commit to opening the email and waiting for it to load before you clock out for the year.
The position is for a senior web engineer, so you either look at the company website and say "hmm" or you open a development app, write the HTML tag, maybe a head or css tag, then save the document.
I actually did the math on my current salary. So with converting it to USD and accounting for 2 weeks vacation and assuming I only work 40 hours a week. 5 pounds per hour is (approximately) one-tenth my hourly rate. So I would only be putting in 6 minutes of work for the entire length of the contract. Which, with my setup, amounts to sitting down, booting up, sipping coffee, and reading all of my slack notifications
Mind you I'm not a senior engineer and I'm also not paid in the top percentile