OK, definately Martin, also I have checked todays Times for you:
Best Low cost Loans:
Based on £5000 over 3 years so you would need to see.
www.yourpersonalloan.co.uk 6.7%
www.barclaycard.co.uk 6.8%
www.moneybackbank.co.uk 7.1%
Cheapest Credit Cards, Introductory deals:
The rates might be if transferring a balance but....
Halifax - 0% - 15m
HSBC - 0% 12m
First Direct - 0% 12m
Standard rates, Barclaycard is best.
All assuming you have a good credit history (which as you have been approved a 100% mortgage atm should be right?)
As your Mortgage has not yet been taken I suppose you could try not declaring it and see if it shows on the credit check etc.
Also worth having a look at www.moneysupermarket.com
See I am helpful - just cautious