Hello and welcome to the forum.
As you are in an IVA it is likely that there will be some premium in the interest rate over and above what are described as "high street" mortgages.
A good mortgage broker will work with you to minimise the costs, and there are lenders who are interested in this type of business.
You will need to have a good sized deposit, have a good IVA payment record, and your IP will probably require that your mortgage does not cost more than your rent today.
Whether you are succesful in gettng the mortgage and the rate you will pay depend entirely on your personal circumstances (and those of any other parties to the mortgage).
On the subject of your loan idea I'll leave it to other experts and contributors to give their views.
Andrew Graveson
Mortgage Broker & Bright Oak Debt Management
andrew@brightoak.co.uk
www.brightoak.co.uk