Now all plumbers charge for call out. Some charge a fair amount. It does not mean there will be any difference in service. All you need to check is that your plumber, if doing any gas work is Gas Safe Registered.
For plumbers in Kent Orpington, Bromley, Sidcup, Swanley Dartford and Bromley visit Guild Plumbing who do not charge a penny for call outs, day or night.