I was listening to that earlier.
It's so poorly reported.it bears little resemblance to what is actually happening.
MHRA is doing what it always does, is keeping a close eye on new data. It is always considering changing guidance, constantly, on every medicine under it's purview. Always.
If it does change it's guidance it won't be because of any pressure group, a single expert having doubts or social media screaming blue murder. It will do so based on global data available.
This usual process is what sceptics use to claim the vaccine is still undergoing testing. It isn't but each new understanding adds weight to that claim.
If Moderna, or any other vaccine, has better outcomes for any age group they'll recommend it. That too would be normal practice.
Sadly so too are the deliberately worded headlines!