Yes it does.
See Relevant legislation:
Statutory Instrument 2003 No. 701.
The Working Tax Credit (Entitlement and Maximum Rate) (Amendment) Regulations 2003
Reg. 9 (8) G
I queried this with the DWP and they confirmed.
/edit. Actually the reg I’ve quoted isn’t directly relevant to the HB side of your query. Perhaps someone else can advise which reg you want. HOWEVER, Disability Element of TC is a qualifying condition for Disabilty Premium of HB. /edit
