When a resident cancels their VM services, it's very rare for VM to spend money & effort in physically removing their cabling as it creates a potential barrier to current or future residents connecting.
Do you have some photos of the alleged H&S risk?
And this is entirely true, the real issue is that removing the cables will cost VM money which they can never recoup, plus should a current or subsequent occupant want VM services it will cost them more again to reinstate the cables.
Not that this is in anyway the OP's issue, so, based on posts from other forum members with similar issues, my advice would be this, you could, if you feel publicly spirited, call VM and request that the cables be removed. This request will absolutely be ignored, in which case give it a reasonable time (and legally 14 days is regarded as being 'reasonable') after which you take a pair of cable cutters to it and dump the whole lot into the nearest skip.
At least you will know that you tried, yes?