Mr T Bag, is this one of the 'small' jobs you intend to take on? To be honest it really isn't an acceptable standard to be charging for is the simple answer. Regardless of the cut you couldn't do with the tools you had, there is a lot more wrong with the install.
Now this chap you did the work for may be happy with the job as i'm guessing his standards aren't very high if he didn't feel the need to alter the abortion that is the towel rail tails before it got tiled. So you may be happy with it and this customer might be happy it with it, but it is well below acceptable standards for most and another customer may well insist you rip out and start again at your cost. As for not having enough tiles, a good tiler could have spent an hour jigging the setting out which meant more cuts could have been used in other areas and I can see at least a whole row of tiles that don't need to be there once the bath is installed... which btw is always better to be installed before tiling.
Back on to the plumbing... who put those isolating valves on the shower tails? The plumber is going to have fun with that one when it comes to putting the shower valve on. No need for those to have been cut so close to the walls. Options are now limited.
F- Must try harder
