There are defined rules at the extreme of your spending but the criteria is not so well defined for general spending and is at the discretion of a Decision Maker.
So I can say that giving your money to relatives will be definitely be treated as Deprivation of Capital as will the early payment of any loans, buying a car should not be an issue nor should buying a house providing you intend to live in it. Buying televisions and other expensive items may not be an issue unless it is seen as a pattern to reduce your savings. Keep receipts for any items you purchase.
Gordon
Nothing on this board constitutes legal advice - always consult a professional about specific problems