I have recently put the B777 on my JAR licence. I applied to the CAA to give a 30 day dispensation to the TRE doing your OPC/LPC. They will require the certificates (copies) of both the 200 and 300 simulators to prove they are JAR compliant. The Dipensation will cost you 90 GBP. They will then send paperwork to the TRE and have him fill this out. Both you and him will have to get together to sign the relevant paperwork. The paperwork will then be sent back to the CAA. You will then be sent a certificate which is valid for 30 days (during the month which your PPC is being done.) The LPC/OPC will be conducted after which you will then have to send the CAA your lastest logbook which should have at least 500 hours of B777 time in. You need to send a copy of your UAE licence certified by the company as well as a copy of your UAE medical. You have then to also send your JAR licence and JAR medical. Finally 109 GBP. I also had to send a further 119 GBP to renew my JAA licence. (in order to renew a licence you have to be current on type or as I did put the type rating on the licence) The previous rating is good for 5 years from your last OPC/LPC if you are just renewing your licence. If you can be bothered with all the bureaucracy you will will finally be sent a JAR licence with the B777 on. Good luck.