Which CustPack to Flash with W595 R3EA037?

My set is w595. I'm currently having R3EA037_GENERIC_LD as Main and S-ASIA-LEVAN as FS and CDA12345678/123_R11A_1206_7066 installed as it came by default with my new set.
As there are more patches available for Generic_LT than LD therefore im going to flash my firmwares to R3EA037_MAIN_GENERIC_LT_RED52 as main and R3EA037_FS_WESTERN-EUROPE_RED52..... First of all, do u think it is a good idea?? Im moving to london next month.

Secondly im a lil bit confused about the CustPack. I have 1223-4114_R1A_GENERIC_WESTERN-EUROPE and W595_1214-5668_R4A_Customized_United_Kingdom. Which custpack (or any other custpack which is better) do u recommend for me. And can u explain the word Customized used in second CustPack i just mentioned??

Any help is highly appreciated.