Phone up your local electrical wholesaler and ask them if they can supply replacement screws for that type of Crabtree CU should only be a few pounds at most.  Alternatively go on ebay and buy the same CU for £10 to £50 just for the screws which hold the front cover on.

Longer term you will need to consider a new Consumer unit with RCBO and SPD in a metal enclosure but for now the EICR should be done to the edition on the CU/board when it was fitted.

Thanks for the help. Wanted to check do you agree this would be C2? 

> consider a new Consumer unit with RCBO and SPD in a metal enclosure
Yes, I do agree this is a long term solution. The place do need some renovation, but not now.

>the EICR should be done to the edition on the CU/board when it was fitted.
This makes sense.

Do these screw looks right? I haven't opened an CU before and don't intend to.
Just to check they are suppose to look that long.

www.ebay.co.uk/.../281879121282

I say say no.  Those screws look like what you would use on the front of a socket or light switch

I say say no.  Those screws look like what you would use on the front of a socket or light switch