UK Dangerous Dogs Act

My OH is planning to come to the UK at the end of the year. He is determined to bring his dog with him (of course!), but I'm worried about how he looks. He's a Labrador cross (potentially with a Staffie) but is unsure of his background for sure. I'm worried about whether he might be classed as a "Pit Bull" looking dog under the UKs dangerous dogs act (also breeds that generally can't fly

He is a big/medium black dog and the requirements for a "Pit Bull" are so loose that I'm worried in case we bring him over and he's not allowed in! I'd like to find out beforehand if we will have any issues but I'm not sure if anyone has had issues with this before? I might just be waiting for something to go wrong and looking into it too much, but I just want to make sure everything goes well and I know my OH would be heartbroken if he has to leave him at the airport to fly back to the US.

Any advice or opinions are very appreciated!