Download the latest version of a2uploader here
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Download the following three firmware packages from the downloads section of this site. The first two are W995 files and the custompack is a C905
MAIN
Downloads - R1EA028_RED53 - W995_R1EA028_MAIN_GENERIC_HI_RED53 - SE Users
FS
Downloads - R1EA028_RED53 - W995_R1EA028_FS_WESTERN-EUROPE_RED53 - SE Users
CUSTOM PACK
Downloads - C905 - C905_1209-4774_R6A_GENERIC_WESTERN-EUROPE - SE Users
do not unzip this custom pack file as it is used in a .zip format
Once unpacked, you should have the following three files
W995_R1EA028_MAIN_GENERIC_HI_RED53.mbn
W995_R1EA028_FS_WESTERN-EUROPE_RED53.fbn
C905_1209-4774_R6A_GENERIC_WESTERN-EUROPE.zip
Install the gordon's gate drivers that come with the a2uploader package first, then follow the instructions from the link below
How To Unbrand Your Phone With A2 Uploader
Hope this helps
P.S.
The above files are a generic english version which should be fine for England, Australia, New Zealand etc.
Be aware that debranding will wipe out all the connectivity settings for internet, message settings, streaming media etc but your sim card provider should be able to have them sent direct to your phone once unbranded.