Hi Aebw and welcome to GoY. That certainly looks like honey fungus to me, check out the RHS website information:

http://apps.rhs.org.uk/advicesearch/profile.aspx?pid=180

As MG says, looks like it. I've uploaded a photo onto my pics to show the fruiting body and the distinctive ring under the cap.

there are 7 species of HF. they are not all as bad as feared. I have one of the less rampant ones, only invading the dying plants, rather than the ones that attack and effectively kill the plant. I sent samples off to the RHS and they identified it for me.