Tax and retirement as a Director

Can anybody recommend a taxation advisor. I am cuerrently a Director and have the option to retire or retain employment with my Firm. I wish to reduce my time committment when I become 55 but need to maintain an income and ideally with my exisiting Firm. Should I resign and become a self employed consultant to them or for tax reasons should I stay employed but negotiate a different arrangement? Any one know of a good advisor?
Bertie

I'm not sure if it makes sense to drive this decision from the taxation impacts, as there are many other factors involved. For example, if you become a self-employed consultant, you lose all protections of employment legislation, unfair dismissals, redundancy etc.