Only Towel Radiator Works? Microbore Blocked?

16 May 2009
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United Kingdom
I am trying to sort my daughters microbore system out and Brittony boiler. The boiler and HW seem OK. However, only the towel rad is heating up, no other rads come on.

Have bled the rads, and very black water came out. My questions are;

Is it likely that the microbore is blocked?

If yes, where is the blockage usually in a case like this, in manifold?

What can I try to unblock, eg. additives, remove manifold, etc?

Will a power flush on blocked microbore do anything?

Any help and suggestions would be appreciated. Thanks.
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