It looks a little more complex than that now we're Part-FCL in the UK. You've now got Article 8 of the Aircrew regulation and Annex III to Part-FCL for conversion of ICAO licences and ratings.
Article 8 says:
(1) Without prejudice to Article 12 of Regulation (EC) No 216/2008 and where there are no agreements concluded between the Union and a third country covering pilot licensing, Member States may accept third country licences, and associated medical certificates issued by or on behalf of third countries, in accordance with the provisions of Annex III to this Regulation.
(2) Applicants for Part–FCL licences already holding at least an equivalent
licence, rating or certificate issued in accordance with Annex 1 to the
Chicago Convention by a third country shall comply with all the requirements
of Annex I to this Regulation, except that the requirements of course
duration, number of lessons and specific training hours may be reduced.
The credit given to the applicant shall be determined by the Member State to
which the pilot applies on the basis of a recommendation from an approved
training organisation.
A look at CAP 804, Section 4, Part Q, Subpart 2, pages 3 and 4 gives.....
C. ACCEPTANCE OF CLASS AND TYPE RATINGS
(1) A valid class or type rating contained in a licence issued by a third country may be inserted in a Part-FCL licence provided that the applicant:
(a) complies with the experience requirements and the prerequisites for the
issue of the applicable type or class rating in accordance with Part-FCL;
(b) passes the relevant skill test for the issue of the applicable type or class rating in accordance with Part-FCL;
(c) is in current flying practice;
(d) has no less than:
(i) for aeroplane class ratings, 100 hours of flight experience as a pilot in that
class;
(ii) for aeroplane type ratings, 500 hours of flight experience as a pilot in that
type;
(iii) for single-engine helicopters with a maximum certificated take-off mass
of up to 3 175 kg, 100 hours of flight experience as a pilot in that type;
(iv) for all other helicopters, 350 hours of flight experience as a pilot in that
type.
ifitaint...