Replacing Toilet

[StrataStruggler]

I have your stock standard toilet and was thinking of replacing it with one that is flush to the wall at the back. Is this a big job to get done? Will the plumbing need to be moved? And is this type of toilet secured with mortar at the base? Should I look for a loo that comes out from the wall the same distance as my existing loo? Any other considerations?

Appreciate any input.

[wonderplumb]

Measure from the wall to the centre of the waste pipe. Then measure where the water point is in relation to the centre of the waste pipe going the other way, ie up the wall. Take these measurements with you when you go shopping for a new toilet. Your friendly plumber will sort out the rest for you.

[StrataStruggler]

In looking for a new loo to replace my existing, have come across the following terms "rear or bottom inlet available" and "s-trap close coupled with adjustable installation". As I know next to nothing about loos, what exactly do these terms mean? And is a loo a loo or are some brands better than others?
Cheers