Kitchen floor tile repair help

[Andy1010101010]

http://imgur.com/BodNuSK

Some help please , how do I fix this ! It would seem the person before me cut a hole out of my floor tile , I've just had a new kitchen fitted and this has been revealed , I'm fuming !!! it's got under floor heating so I can't lift the tile ! And I'm left with this monstrosity on the floor , I've got no spare tiles as the floor was laid years ago and obviously don't want to go down the new floor route

 

[Newboy]

The only option would seem to be coloured grout to fill the hole

 

[Andy1010101010]

The only option would seem to be coloured grout to fill the hole

i feared that would be the case 5k kitchen ruined