Investigations reveiled that at either side had been cast large blocks of concrete... Far too much for Colin and his lump hammer. Mechanical assistance was required.
So after some searching, looking at both hire and purchase options, we found what we thought was a small concrete breaker on Ebay UK for £95 with £6 delivery to us here in France. Interestingly the same item on Ebay France was €269. The said item was ordered...
Today it arrived... However it is a little larger than we expected...
It is a full blown tremendously powerful concrete breaker.
It sure made short work of the concrete at the side of the shower tray
In fact it is so powerful I was shattered after removing just one side.
It is certainly value for money and poses the question how is the postage only £6 when it cost me €41 to send a router back to Amazon (Amazon did refund it).
So I suppose size doesn't matter, it's doing the job. You could also say "Should have gone to specsavers"
The bonus is I can put an advert on line "L'homme à la location avec grand outil"