If you bought €10k of Bank of Ireland at €9.30 you would have 1075 shares. If you subsequently initiated a short spreadbet on Bank of ireland, betting €10.75 on each cent of decline in share price, you will be left hedged.
Price rises to €9.50, stock is worth €10,212.5 but you owe €215 on your spread betting account.
Price drops to €9.10, stock is worth €9,782.5 but you are up €215 on your spread betting account.
While you have these two positions on, you arent affected by price movements, but you lose out on charges.Realistically, doing this makes sense only if, you are putting in the hedge for short periods of time, otherwise dont buy the stock in the first place.
You would typically have to post 10% margin on the spreadbet.