Andrew McKay wrote:
As others have contributed, a cheap SDS is unlikely to give you much
pleasure in this environment.


My £25 drill seems to deliver over twice the impact of others mentioned,
so whyever not?

Depending upon the size of the concrete slab another possible option
would be to dig underneath if you can, then light a fire beneath.
That's how the attackers brought down castles in the good old days
before Black Adder I took place.....

Well, if we're into daft suggestions, dig around the block, fill the
hole back up with ppuddling clay, pour in a bucket of brick acid,
repeat as necessary. Alternatively just wait until erosion has
taken care of the job.