The Mortgage Operation completed 7,000 mortgage applications worth almost £500m in the first half of 1999.
The packager says the £500m figure ranks it alongside the top 10 lenders in terms of lead generation.
It says that its success in the first six months to the end of June 1999 is due to having invested heavily in its administrative system to enable it to cope with increased volumes of business.
TMO marketing director Frank Butler says: "We are delighted with these figures which not only reflect a buoyant housing market, greater consumer confidence but also the intermediary's trust in TMO."
Market Harborough Building Society is launching a tracker mortgage which is guaranteed to never be higher than 1.25 per cent above the base rate.
The tracker has no arrangement fee, redemption penalties or mortgage indemnity guarantee premium and interest repayments are calculated monthly.
Borrowers are able to make overpayments, underpayments and take payment holidays and switch to the lender's variable rate at any time.
IFAs are able to negotiate a procuration fee on completion.
Chief executive Philip Dearing says: "The Flexible Base Rate Tracker includes monthly interest calculation, drawdown facility, payment holidays which along with a reduced interest rate should help ensure its success."