HTC One (M8) in UK on US TMOB

I hope this post is in the right place .. what it is i got the M8 from China (new in box) but on arrival i noticed the Variant was US T-Mobile - my SIM does work (giffgaff) but i'm wanting to flash the O2 RUU but i do not know what Firmware to use with the RUU.

have tried to change the CID & MID but again, i'm not very confident with all tht and do not want to brick my phone..

RUU_M8_UL_L50_SENSE60_MR_O2_UK_4.20.206.1_Radio_1. 25.21331147A1.06G_20.69.4196.01_F_release_414450_s igned

I'm S-Off (Sunshine)
Unlocked
TWRP Custom Recovery
Rooted SuperSU


D:\>fastboot getvar all
(bootloader) version: 0.5
(bootloader) version-bootloader: 3.19.0.0000
(bootloader) version-baseband: 1.23.213311491.05G
(bootloader) version-cpld: None
(bootloader) version-microp: None
(bootloader) version-main: 4.20.531.5
(bootloader) version-misc: PVT SHIP S-OFF
(bootloader) serial No.
(bootloader) imei:
(bootloader) imei2: Not Support
(bootloader) meid: 00000000000000
(bootloader) product: m8_ul
(bootloader) platform: hTCBmsm8974
(bootloader) modelid: 0P6B13000
(bootloader) cidnum: T-MOB010
(bootloader) battery-status: good
(bootloader) battery-voltage: 0mV
(bootloader) partition-layout: Generic
(bootloader) security: off
(bootloader) build-mode: SHIP
(bootloader) boot-mode: FASTBOOT
(bootloader) commitno-bootloader: 6768a7b1
(bootloader) hbootpreupdate: 11
(bootloader) gencheckpt: 0
all: Done!
finished. total time: 0.021s

Am i able to flash a UK Firmware with that O2 RUU please?

Thank you in advance

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