the police have new guidelines that state a man can be charged now whether the woman makes a statement or not. the idea was to protect vuilnerable women from being too scared to give a statement as they knew police would act anyway.
sdly although the police can and will press charges, unless the owman makes a statement its still pretty difficult to get a conviction without her evedence.
In this case i would hold strong hopes as there were two independant witnesses hearing what had happened. but a good barrister probably would be able to argue that you didn't see what had happened and if she claims she bumped you cannot prove otherwise
Well done to you and your DP Aimsmum. there is a very large proportion of society that really would just ignore what they heard as they arte too scared to get involved.