How to change this?

[Kentcounty]

Has anyone got an idea how to change the cartridge in this shower.
I have removed the flow knob to reveal inside, but can't work out how to change the cartridge to stop the dripping.
i see there is two hole either side, is there a special tool that goes in here?
I think this may be a Victoria plumb shower.
Thanks

 

[Riley]

Hi and welcome. Pictures tell a thousand stories here. As a new joiner you won't be able to add pics for a little while. Easiest thing is set up a photobucket account or similar and post a link to the photo. Some of the guys on here may then recognise your shower.