LONDON, July 29 - Britons piled on a record amount of debt in June even before the Bank of England cut borrowing costs to a 48-year low of 3.5 percent earlier this month. The Bank of England said on Tuesday that net consumer credit leapt by a record 2.164 billion pounds in June compared with 1.874 billion pounds in May and well above analysts' forecasts of a rise of 1.6 billion. Lending secured on dwellings rose by 7.807 billion pounds, also the biggest jump since comparable records began in April 1993. Total consumer borrowing rose nearly 10 billion pounds last month, the biggest jump ever and up a record 14.0 percent on a year earlier. The record level of new borrowing, made before the BoE cut interest rates this month, is likely to exacerbate fears that spendthrift UK consumers are taking on more debt than they can safely handle as they continue to spend freely, exposing the economy to the threat of a more serious correction later on. Official data last week showed retail sales jumped by 1.9 percent in June. However, one of the arguments for leaving rates on hold earlier this month was that some Monetary Policy Committee members were less worried that a cut in borrowing costs would push the housing market and debt levels higher. Mortgage approvals, loans agreed but not yet made, jumped to 108,000 in June from 91,000 in May, suggesting that the housing market may start showing renewed signs of life in the months ahead.continues to show signs of life. Data released earlier on Tuesday by the Nationwide building society showed that house prices jumped by 1.0 percent in July.