A Bridging Loan will normally cost in interest between 1 and 1.5% of the loan amount per month (so £60000 loan would be £600 - £900).
You also need to pay for a valuation and the Bridging Companies Legal Costs which will be around £1350.
There will probably be an Arrangement Fee of up to 2% also (£1200)
If you had the loan for 6 months you will be looking at £6150 - £7950 depending on the interest rate charged.
You could release some equity in your current home via a traditional remortgage and even if you paid 6 months interest on that plus Early Repayment Charges at 3% you would only be looking at around £3300.