Sounds like brick and possibly 'blown' plaster in some places. This is a good brand.
https://www.screwfix.com/p/fischer-duopower-wall-plugs-8-x-40mm-100-pack/1820p#_=p
Could be plasterboard dot and dab over brick. If that's the case you need a mixture of solutions!
Thanks very much, will give those a try
6mm is enough for a lot of jobs but it's useful to have 8mm if you are hanging weight or don't trust the walls. Use a masonry bit .5mm down from the plug size.
@clockwork_killa started
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Sounds like brick and possibly 'blown' plaster in some places. This is a good brand.
https://www.screwfix.com/p/fischer-duopower-wall-plugs-8-x-40mm-100-pack/1820p#_=p
Could be plasterboard dot and dab over brick. If that's the case you need a mixture of solutions!