SLOUGH ESTATES VIEWS 1987 PROSPECTS CONFIDENTLY Slough Estates Plc <SLOU.L> said it views the prospects during 1987 with confidence. In a statement accompanying its 1986 results, it reported a rise of over 10 mln stg in 1986 pretax profit to 49.6 mln stg and said there are signs that the existing threat of excess supply may be lessened in 1987. There has also been a return of interest in industrial investment. An external appraisal of the group's investment properties was carried out last year which found their gross value to be 851.3 mln stg as at Dec 31.