The present invention relates to apparatus for retaining at least one umbilical in relation to a string. The apparatus (30) comprises a body (32), first (38) and second members (40) and first (50, 52) and second fasteners. The body and the first member are movable in relation to each other between a first disposition, in which the body and the first member define a first bore (34) between them for accommodating a string, and a second disposition, in which the body and the first member are spaced apart from each other such that the string can be received in or removed from the first bore.