First, the easy part. Playing games in the street is contrary to the Highways Act of 1971. Plain and simple.
Now the difficult part – enforcement. The police usually do not want to know, especially if children are the miscreants. Their argument usually is that the offence is only punishable by way of a fine, children cannot be fined, end of story. The local authority may be willing to take an interest. It varies across the country.
You need to adopt a two pronged approach. Firstly contact your local neighbourhood policing team. If they are unwilling to take an interest, raise the matter with the Borough (or area) Commander. The police do have an obligation to investigate your complaint. They will need help identifying the culprits and may then approach them individually to tell them what the law says.
Also contact your local authority. They too may be interested.
The idea that this problem may be dealt with by way of an ASBO is a little optimistic. The road to ASBO imposition is long and arduous (despite what the government may have you think) and in many cases should not be necessary.
You will have to be persistent, however, and generally make such a nuisance of yourself that the authorities eventually realise it is easier for them to take some action than to continually deal with your complaints.