Peripherals and components distributor Electron House Plc has agreed to pay up to UKP8.35m for the HB Electronics Ltd subsidiary of Rockwood Holdings Plc. Electron House will raise the cash by means of a conditional placing of 6.1m new shares through N M Rothschild and Cazenove & Co, and has arranged a clawback facility so that shareholders may subscribe for the stock. Electron holders will be entitled to one new share for every 2.21 ordinary or 3.198 preference share they hold; it also forecasts a 180% profits hike to at least UKP2.65m for its year just ended to May 31 1988.