Can I identify what pipes on a manifold connect to a specific radiator?

[Terry85]

I have 10mm microbore from a manifold under the boiler supplying 5 rads downstairs. The pipework is buried under the concrete floor.
I found a damaged loop under the floor which must have previously supplied a rad no longer there. British Gas have now capped it off. As the loop is no longer there I’ve read that this increases the chances of a clog up.
I was wondering if I could identify those two pipes at the manifold and cap them there?
Pics attached

 

[Terrywookfit]

There should be no loops.
To identify pipes.....Turn off all rads and open each one individually to see which pipes are getting hot.