Hi everyone
I am looking to replace the taps in my bathroom which look like this:

There is no cap on the tap to get a spanner around, no screws anywhere on the outside to unscrew and no visible way to remove them that is obvious other than turning of the main water and turning the head until it falls off. Any ideas? A friend helped with the basin taps and we just have up and sawed the tops off (And had to drill into the skirt bit to move that too!).
There are 4 taps to remove- is there a way or am I whipping out the hack saw?