DIY Question - Is this SWA? or Hi-Tuff

[KeenPensioner]

My sister has a cable feeding an outside boiler (see image). I want to tidy it up by adding a new piece of cable as shown. I can't see any ends of the existing cable to determine whether it's SWA or Hi-tuff. Is there any way of determing whether this cable is swa?

 

[pc1966]

Is there no other way to detect whether a cable has a swa sheathing?

Magnet.

 

[KeenPensioner]

Magnet.

Thanks for replying. I have a very strong magnet and will try that

 

[KeenPensioner]

Thanks everyone - I tested it with a magnet and its SWA.