for you to sub contract to mitie, u have to tell them how much u make and what u contracts are,
tesco operate a red card system and they red card a lot of stuff, i know a bloke who use to do the cleaning for them and then get something like 3 hours for the whole store including windows, as they could never get window cleaners to come back, save you self a laod of hassle and avoid them, as mitie will drop u as soon as some one cheaper comes along