Hi Dalglish60
To answer your question " Is it possible to lose entitlement to full housing benefit if guaranteed pension credit inclusive of SDP is ceased after a hypothetical scenario allied to say savings that way far exceed the legal limit allowed". Housing Benefit is administered by your local Council but an unqualified answer would be Yes.
As your query is complex I think you should contact a local Welfare Benefits Advice centre for a comprehensive assessment of your situation.
David
Nothing on this board constitutes legal advice - always consult a professional about specific problems