A spokesman for the liaison committee overseeing talks between the Board and JLC described Sir Jeffrey as the UK’s foremost constitutional barrister, and said the committee was delighted he had agreed to provide advice.
Plans for unification of the two bodies, which were first presented to deputies nine months ago, envisage a two-chamber house, one loosely resembling the JLC, the other the Board. The two houses would jointly elect a president.
The JLC consists of representatives from 25 affiliated organisations plus 10 non-voting vice-presidents.
The Board has around 290 deputies, who are mostly elected and who represent 140 synagogues and 30 communal organisations.