Guy King wrote:
The message
from John Rumm contains these words:

That's not a cheapie - that's 50 quid!

Aright, try part number 88952 (about half way down the above page)

Trouble with the lighter drills is they offer a much lower impact
energy. The 5kg model that everyone sells gets the job done very nicely.

Cheaper lighter ones all suffer from this.
More expensive lighter ones do OK.