How much would you charge to fit a mixer shower, pipework is accessible & would need approx 1.5m runs. No previous shower installed so I just need to T into existing pipework & run down for mixer,I don't particularly want the job as when I visited the property the guy told me he already had a good plumber but he has gone vat (ie legitimate tax etc etc) as am I...?! Sometimes you get a feeling that you should decline a job...