Unfortunately @MummyOf1Boy is correct. There is no 'new law' around forward facing until 15 months. There are 2 laws running along side each other.
For a weight based seat the legal MINIMUM is forward facing from 9kg.
There is a separate law for height based seats which is forward facing from 15moths.
These are both legal. It is not rear facing until 15 months for all seats.
But they are the MINIMUM in car seat safety.
Please @MummyOf1Boy do NOT forward face your 9 month old. You say if you thought you were putting your child in any danger you wouldn't do it. Well sorry but you are. If you are in an accident or even just a 'prang' at 30 mph your child can be internally decapitated and die. It is so dangerous.
Children should be rear facing until AT LEAST 4 years old, their bodies cannot cope with the pressure on their spinal column in the event of an accident and it can literally be the difference between life and death.
It is not scare mongering, it is fact. Rear facing your child is 500% safer.
Imagine some arsehole driver smashes into you, even at 35 mph and your child dies from internal injuries, how would you feel knowing that if they were in a rear facing car seat, they would have survived? Could you live with that guilt?
I couldn't.
That sounds dramatic but that is the reality.
@MummyOf1Boy please turn your baby round.