The application relates to a centraliser. A centraliser is disclosed for an oil, gas or water well, the centraliser having a body, and the body having a bore with an axis, the bore being configured to receive a tube to be centralised, the body having at least one resilient device configured to extend radially from the axis of the bore, wherein the body has at least one collar member extending radially inwards from the centraliser body adjacent to an end of the body. The collar can be formed separately from the body and attached subsequently, so that the body and the resilient device can optionally be formed in a single stamping or forming step from a single sheet of resilient material. The collars (typically at each end) are typically fixed co-axially in the bore so as to be resistant to axial movement of the collar member within the bore relative to the body of the centraliser. A method of centralising a tube in a borehole for an oil, gas or water well, and a method of making a centraliser for centralising a tube in an oil, gas or water well are also disclosed.