How to tell if type A or AC RCD without markings?

[HappyHippyDad]

A customer has been told by British Gas that their boiler requires a type A RCD.

Below is a picture of the existing CU.

Does anyone know if these RCD's (CGD - control gear direct) have a marking somewhere, or, if they are just always Type A? Or perhaps always Type AC?

 

[westward10]

No markings assume it is AC this is suggested in GN3.

 

[plugsandsparks]

Sometimes the markings are on the side (which you cannot easily see) - one of my EICR peeves

 

[Avo Mk8]

The CGD products (now Lewden?) are still sold by Denmans Denmans | Electrical Wholesaler Supplies - https://www.denmans.co.uk/den/

Edit....just noticed this...
Looks like they would be type AC by default, but a type A does exist/is available?

 

[westward10]

You can always ask the manufacturer.

 

[Pretty Mouth]

New type A have the symbol on the front:

CGD CGD80/30/2A | 80A 30mA 6KA Type A RCCB | Denmans

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www.denmans.co.uk