Toilet installation

I would like to enquire about replacing my toilet basin.

My current toilet is an older type and is not very efficient when flushing. It takes quite a long time before it is ready to flush again, so I would like to replace it with a newer, more efficient model.

I would also like to ask if you can remove and dispose of the existing toilet as part of the work.

If possible, could you please let me know whether this work can be carried out on a Sunday?

Could you also advise on your availability and provide an estimate of the cost?

Thank you very much.