Where to buy new part for door lock

Frith

As well as the key, my sliding patio door has a catch (inside and outside) that holds the door closed. You have to move the latch so you can lock it with a key. 

It has snapped off inside the house. 

Does anyone know where I can buy a new one? 

Thank you. 

Alderbank

Are they like these patio handle levers?

If so, a fiver from Amazon.

https://www.amazon.co.uk/Fullex-Replacement-Patio-Handle-Lever/dp/B00MXZRL1G/ref=asc_df_B00MXZRL1G/?tag=googshopuk-21&linkCode=df0&hvadid=696352102755&hvpos=&hvnetw=g&hvrand=14002167773040653506&hvpone=&hvptwo=&hvqmt=&hvdev=c&hvdvcmdl=&hvlocint=&hvlocphy=1007359&hvtargid=pla-699952605967&psc=1&mcid=d06396c4328b37a5ac90f8334d425dbc&gad_source=1

Frith

Ah, lovely, they look just the job. 

I've just had to shut the door from the outside (in the dark) then come into the house via the garage before locking it from the inside. That is soon going to get annoying!

Thank you. 

Frith

I'm not quite sure where the Allen key would fit but I'll look again tomorrow. 

FreeBear

Frith said:

I'm not quite sure where the Allen key would fit but I'll look again tomorrow.

Little allen screw at the top.

Vortigern

Is it possible to swap the inside handle with the outside one? My patio door doesn't have an outside latch lever and you've probably never used yours.

Frith

Vortigern said:

Is it possible to swap the inside handle with the outside one? My patio door doesn't have an outside latch lever and you've probably never used yours.

Yes, it is!