Hmm, this is an odd one, I don't have the best memory in the world I admit, but I do remember reading 'something' which stated that JB had taken out a loan, for soft furnishings or something, the figure of £2000 seems to ring a bell.
Regardless, the reality is irrelevant, I don't believe anybody is suggesting he murdered his family because he was in debt to the tune of a few thousand pounds.