An idea regarding cycle lanes in London

And beginner/novice cyclists are often killed while attempting to filter through outer lanes.

Are they? Most of the threads in rider down suggest differently

Having a clear cycle lane would help non-pro cyclists a lot, especially on the euston road, whitechapel road etc where many collisions happen.

And many collisions happen elsewhere in London - why single out those 2 roads? Are they pparticular blackspots?