Pretty poor to be honest. If it came from an eu country it’s fair enough but since it came from a UK-based country it’s careless, and makes you wonder what other stuff they did wrong when building it.
Personally I’d swap the levers (it’s pretty easy) and check all the bolts etc. It’s not a huge deal by if you’re not confident to do that, you should take it to a bike shop and send the bill on to StartFitness IMHO.
Just ride it, you’ll adapt pretty quick…
That’s irresponsible advice. While there may be some people who can adapt pretty quickly, a lot of us are now hard-wired. At any rate have multiple bikes and having different setups across bikes is silly. Also while some people just use both brakes simultaneously, any decent rider will use F+R independently and subconsciously. It’s nothing to do with hand signalling btw.