there is some pod casts on the joe duffy show all about them,, i had them 'seal my parents roof last year, with paint all for 1900e , they wanted 2500e,,
anyhow to cut a long story short,, another crown were coming to do the tarmac,, i waited for them ,, had the gate locked,, tokk pics of them when they arrived in the UK reg truck,, asked them to see their C2 cert for carrying out this work,, they left sharpish,, went to the guards and of course a false number plate on truck,, !!!!!!!!!!