Mikey- you need to do some reading. Try this for a start.
Gun Law in the UK
Bottom line- you are not going to buy a handgun- semi auto or otherwise- in Manchester- or anywhere else in the UK- uless you have a Firearms Certificate, AND the firearm is more than 300 mm in length (11.81 inches). You can check the Bury gun room in Manchester for suggestions for a handgun dealer- there are not a lot of them
Note to our members in the UK- I am a Yank- if I am in error, please correct me. Thanks-