British Aerospace Plc, a substantial investor in the SD-Scicon Plc combination, although its holding has been diluted from the 29.9% of Systems Designers Plc it held prior to the merger, is extending its computer investments by subscribing a total of $17.8m for new common and 8% cumulative convertible preference shares in Tampa, Florida aircraft simulator builder Reflectone Inc, where it already holds 6.25%: if all its holdings were converted and if a parallel share buy-back plan launched by Reflectone is taken up in full, British Aerospace would end up with a holding of about 47% in the company.