Greeting from Nottingham 

 It sure if anyone know where I can buy a bell box for a Gardtec 300 came off in a storm in June also if any one has a user manual or engineers manual I would really appreciate a copy thanks

Any bell box will work , unless you have some kind of wireless system , I assume cable is still there 

 

You just need to open panel if you have correct codes look at bell connections and match upto new bell

Everything works on inside no sound on outside because the storm blow off the box but no installation instructions for fitting new one would you know where I could get kne

Like I said , buy any bellbox they come with instructions simple Honeywell ag6 will work

 

Side note get an engineer to fit it for you, you could find manuals on Google , this is an old alarm you should upgrade it like you might upgrade your phone or computer 

Ok thanks for you help

We do not provide installation instructions here for security reasons.

If you have a wired system it is likely any wired external sounder will suit.

 

Don't buy equipment if you are not going to DIY, I personally wouldn't install kit that someone else had bought.

If you don't feel competent for the task at hand get some prices for a service check and new external sounder.