Broadcast English has to be regional, ethnic, mockney anything but posh RP unless you are the studio based anchor

For OB’s use aged footballers, ex cricketers, former athletes, ex car thieves, short bald people with mockney accents, former con merchants, lots of northern ireland brogues, discredited city brokers, a couple of aussies doing Europe even. In fact anyone who can read an autocue verbatim without falling over, the script written by a work experience second jobber… then we get onto Wossy and Brand….all of the above fits…
So to answer your question to be big (and overweight is good
if you are doing showbiz, film ints, competition voice overs and cooking – might have to add in swearing) don’t offer perfect English, your controller might be a 24 year old producer, possibly a late developer from the MTV generation. I fear the wossy/brand backlast will cause middle regional management to crack down on perfectly harmless local radio and tv journalists, many will be asked to leave, last in first out and aas they are cheap to run who really cares? That is what you are facing, all very sad.