Thanks, I picked up a couple of inner tubes today from my local chandler (cost me somewhat more than 1 euro 😯 )
Their advise is to check there is nothing sharp on the rims, replace the tube and inflate to the pressure shown on the rim (25psi) not the tyre (2 bar). He felt is was just one of those things and he had heard of the actual red rim shattering in the sun 😯
On checking 25 psi = 1.72 bar and 2 Bar = 29.007 psi
So will fit the new tubes and see what happens, watch this space…………………..