L'esame per l'ATPL pratico puoi farlo,se non sono cambiate le cose negli ultimi dieci anni,quando hai totalizzato almeno 1500 ore di Multi-Crew flight.

G1.2 FLYING EXPERIENCE REQUIREMENTS FOR JAR-FCL ATPL(A)
The holder of a UK national CPL(A) should refer to Section A10.1 for details of the requirements to ‘upgrade’ to a JAR-FCL ATPL(A).
An applicant for a JAR-FCL ATPL(A) shall have completed as a pilot of aeroplanes at least 1500 hours of flight time (see G1.2 Notes). This must include the particular requirements specified in a, b, c, d & e below. Each of these requirements must be met in full but, hours may be credited, where appropriate, towards more than one requirement except where stated otherwise.
a. 500 hours Multi-Pilot operations on aeroplanes type certificated in accordance with the JAR/EASA-CS/ FAR-25 Transport Category or the JAR/EASA-CS/ FAR-23 Commuter Category or BCAR or AIR 2051;
b. i. 500 hours as Pilot-in-Command under supervision; or
SECTION G
Jar-Fcl atpl (aeroplane)
2
ii. 250 hours Pilot-in-Command (PIC) of Aeroplanes, or;
iii. 250 hours made up by at least 70 hours as PIC and the necessary additional flight time as Pilot-in-Command under supervision (PICUS). (see Notes below).
c. 200 hours Cross-country flight time of which at least 100 hours shall be as PIC or as PICUS;
d. i. 75 hours Instrument time, can include (ii); ii. 30 hours (max) Instrument Ground Time.
e. 100 hours Night flight as PIC or as Co-pilot (PICUS or P2). Part or all of the 100 hours Night flight may be completed in an aeroplane flight simulator.