Attempted motorcycle theft at Downhills Park

I had the unfortunate experience nearly been robbed at 6pm by a group of teenagers at the junction of Downhills Park Road and Belmont Round. The incident happened three weeks ago as I came up to the zebra crossing on my motorcycle, one of the teenagers threw a basketball at me which hit me on the head, three others walked into the road towards me as I slowed down as a distraction technique. Two others came out from behind a parked car and pulled a knife on me as they wanted my motorcycle. I panicked and was lucky enough to get away. Thankfully I narrowly avoided a crash with an oncoming car at the roundabout.
 
I called the police who told me they are spending most of their time been getting called out for these type of call outs. I heard nothing more about this and put it down to a one-off because I am very familiar with the area and the park, I am aware there has been a substantial increase in muggings and robberies near the park.
 
That was until Tuesday at 6pm again when I was driving past the same junction I noticed two teens on what was clearly a stolen moped. They followed me up Downhills Way to the intersection of Lordship Lane, only for there were two other motorcyclists at the traffic lights they would have tried to rob me. I ended up breaking the next three sets of red traffic lights trying to get away from them before losing them.
 
If you are a motorcyclist it would be wise avoid the junction of Downhills and Belmont, they know there is no CCTV in the area, and the roundabout is always busy, which makes motorcycles sitting ducks.