Essentially you need to sit all of the module exams, and then do the required amount of experiance.
For the B1.1 you'd need to do
Module 1 Mathematics
Module 2 Physics
Module 3 Electrical Fundamentals
Module 4 Electronic Fundamentals
Module 5 Digital Techniques/Electronic Instrument Systems
Module 6 Materials & Hardware
Module 7 Maintenance Practices
Module 8 Basic Aerodynamics
Module 9 Human Factors
Module 10 Aviation Legislation
Module 11 Aeroplanes Aerodynamics, Structures & Systems
Module 15 Gas Turbine Engines
Module 17 Propeller
However, as you already have a BEng (you don't state which), you qualify for some exemptions from doing all of the modules as follows:
Applicants with a Mechanical Degree will be credited Module 1 (Mathematics) and Module 2 (Physics).
Applicants with Aeronautical Engineering or Air Transport Engineering Degrees will be credited Module 1 (Mathematics), Module 2 (Physics) and Module 8 (Basic Aerodynamics).
Applicants with Electrical or Electronic Degrees will be credited Module 1 (Mathematics), Module 2 (Physics), Module 3 (Electrical Fundamentals) and Module 4 (Electronic Fundamentals).
Applicants with an Avionic Degree will be credited Module 1 (Mathematics), Module 2
(Physics), Module 3 (Electrical Fundamentals), Module 4 (Electronic Fundamentals) and Module 8 (Basic Aerodynamic).
So thats the Modules thing sorted, you can either Self Study, and book yourself into an exam centre (Gatwick for example) and sit them, or join a college and do them as part of a course.
Once you have all of your exams passed, you need to do the experiance as required before you will be issued with a license.
Usually this is 5years, for those entering the industry, however, as you work for Rolls Royce, I suspect you fit this exemption:
‘Skilled Worker’
A skilled worker is a person who has successfully completed a course of training, acceptable to the Authority, involving the manufacture, repair, overhaul or inspection of mechanical, electrical or electronic equipment. The training would have included the use of tools and measuring devices.
If so, you can reduce that to 3years experiance needed.
If you were to jack Rolls Royce now, and say, get a Mechanic/Tech job somewhere like the BMI hangar at EMA, 3years of working there, would give you plenty of time to sit the exams and sort those, and you'd be in a great position to apply for a license!
Hope that helps mate.
Check this document (where I sourced my info):
http://www.caa.co.uk/docs/177/srg_el..._Cert_Tech.pdf