I am a massive novice when it comes to this, please can you help? I bought a S7 edge SM-G9350 from hongkong but it did not GooglePlay etc. I live in the UK and wondered how to get my phone software to be the same as UK phones? I saw this link but it is a bit advanced for my understanding. Thank you.
Obtain Gapps from here, and then in fact you have two alternatives:
Install custom recovery via Odin and then flash Gapps with it.
Try to install Gapps via
adb sideload. Not all devices/vendors allow this, but you can try.
Firstly you need enable ADB, then drop the Gapps zip-archive into folder with ADB and run
adb sideload gapps.zip
There is also manual way of install (described for example here), but it's rather cumbersome.