Rapacious Hull-based Radius Plc yesterday announced its acquisition for July, that of of Slinn Computer Group Ltd, a South Yorkshire Unix software and systems house. In June, the company agreed to acquire ICL software house MGB Computers (CI No 942) and has made a string of other acquisitions since its flotation. Radius is paying with 708,230 new shares, 218,720 of which have already been placed on behalf of the vendor at 138 pence, to satisfy the initial consideration of UKP1m. An additional consideration, limited to UKP200,000 and related to profits for the year to December 31 1988 may also be paid. Radius has applied to the Unlisted Securities Market for permission to deal in the new shares issue. Slinn reported pre tax profits of UKP111,442 on UKP2.1m for the year to December 1987 with a large part of its business being generated by sales of the Progress Unix generator.