2) The unrestricted FI(A), is permitted to tech IR in integrated course?
From Paragraph 10.4 Section 1 Part E to CAP 804 (my underlining):
A student on a CPL(A)/IR, CPL(H) or ATPL(A)/(H) Integrated Course of flying training may log flight time on instrument training flights as SPIC when flying with an instructor qualified to give instrument flight instruction. The instructor must be the holder of a valid professional licence, instructor rating, instrument rating and IRI privileges. SPIC time etc ........