Home DIY

I think you should get yourself a decent combi with a couple of torque settings and new half decent masionary bits. While an SDS is better and will deal with concrete I've never had any problems with my DeWalt combi in brick since using new bits and the high torque + hammer setting.

Pretty sure Screwfix still have deals on DeWalt and Makita impact + combi sets.

Eg two batteries and a box https://www.screwfix.com/p/dewalt-dck2510l3t-gb-18v-3-0ah-li-ion-xr-brushless-cordless-twin-pack/682fk#product_additional_details_container

The hammer drill action on a combi drill is never any good. The way it works on a combi drill is there are two serrated plates that engage and as the chuck turns these are pushed together which in turn pushes the bit into the wall. Doing it this way generates more noise than forward motion and the noise made is of a frequency that means it travels pretty well through solid walls so you'll be pissing off the neighbours.

An sds on the other hand has two motors one turning the Chuck and bit, the other turning a cam which drives the bit forward. It's more efficient, drills a lot quicker - especially in stone walls and makes much less noise.

If I owned a flat in a building like yours my first DIY purchase would be an sds and some quality bits to go with it.

This is a good buy and if used for DIY will likely out-live you.

Shit drill bit? Doesn't even look like it's gone through the plaster. Get nice new masonry bits. Unless your wall is made of unobtainium (unlikely) or concrete (doubly unlikely in your place I would have thought) a cordless should be able to get through it.

Also try a smaller, sharper masonry bit first.

Cheapo Titan/Erbauer SDS will make drilling through that stuff super easy for fifty quid. Only reason I wouldn't get one is if you're short if storage space.