It was interesting to see this long-forgotten independent English feature, which was barely seen when it came out. But the kind of over-excitement that tends to pronounce any "rediscovered" film some kind of classic would really be wrong-headed in this case. The main problem is that while it's understandable to want to cast nonprofessionals in order to get a more "realistic" ambiance in this kind of drama, you still have to give them SOME kind of basic training so they don't look like deer before headlights in front of the camera, just reciting their lines and holding themselves stiffly as if for a still photo. And that's exactly what happens here.
The adults playing parents are OK, but the juveniles are stilted, and the two who were deemed good-looking enough to be leads are so wooden we feel nothing for them. Eventually the barely-there plot hinges on their running away to have some alone time (since both their single parents are hostile towards their being together), and I guess we're meant to root for Young Love, but these two can't express anything--whether love, lust, or just some basic intelligence.
The only real point of interest is the location shooting, and glimpsing a side of (East) London that obviously never got the least "Swinging." There's also a decent enough rock soundtrack. But whether we're focused on the mildly criminal doings of the first half or the runaway couple of the second, there's no narrative tension, and the actors are stiff as boards. A 5 is actually a very generous rating in terms of any entertainment or dramatic value, but I boosted it up from a 4 just for the sake of it providing a time capsule.
