Taken from the CAA website.
Application for Initial Issue, Amendment or Renewal of an Engineer Licence (Form 19)
Certified true copy of your valid passport, EAA/EU National Identity Card or full Photographic Driving Licence certified by your Quality Manager.
Certified true copy of your current Part 66 Aircraft Maintenance Licence certified by your Quality Manager.
Certified true copies of the JAR/Part 147 Certificate of Recognition(s) (applicable to the type(s) applied for) covering theoretical and practical elements certified by your Quality Manager.
If this is the first type rating applied for then 4 months worth of approved OJT must be submitted certified by your Quality Manager.
Certified true copies of the logbook/worksheets showing evidence of the practical maintenance experience gained (if Practical elements not completed) certified by your Quality Manager.
The Recommendation attachment ensuring that it has been completed by your Quality Manager in support of your application.
If applying for change of name and or nationality a certified true copy by your Quality Manager of the supporting document e.g your valid passport/change of name deed poll/marriage certificate.
So 4 months of OJT required for first type.