I’d definitely err on the side of caution and get a narrow wide chainring designed for 1x use. Especially if compensating for 1x at the front with a wider range cassette at the back. Guessing the OP is in the UK if he’s got a Boardman bike, some of our roads can be pretty terrible and having a chain come off while TTing at speed is a very high chance of crashing!
Worth looking at https://www.pyramidcycledesign.co.uk/shop.php and https://www.aero-coach.co.uk/store/AeroCoach-ARC-1x-chainrings-p202122711 if you want something designed for 1x TTing. Would also consider the roads, cadence and speeds you ride at and whether something bigger than 52 would work. Apart from the simplicity and potential aero benefits of 1x, the other benefits are drivetrain efficiency from being in bigger cogs both front and back, and the ability to still lay down power on fast downhill/tailwind sections without spinning out. In which case you really want to go as big as you can while still having a small enough gear to get over the steepest gradient you’re likely to encounter in races without going into the red or having to grind.
I run a 58T, works really well for me as I don’t race TTs on anything too steep.