Hang on, is it pricework or is it daywork of £100 a day? it's either target, where you get paid what you stick up, or it's some much per day. If it's target, you also need to know what your fall back rate is when you can't get on because the gear isn't there or the brickies aren't ready.
have to say Lee, Durham to York everyday is a bit of slap to stick a bit of putlog up - you'd be better off ringing murray mcgowan - that robbing cnut is always looking for men!