Hey lintur, welcome to the forum. Unfortunately you can not include secured loans and mortgages in an IVA but if you can post a few more details regarding your circumstances, mortgage and other debts then the technical experts can help you further.
Just to remind everyone that a secured creditor has the right to revalue its security at any stage during an IVA, so any shortfall which is deemed to be unsecured can be included in the IVA.
I had a secured loan which, upon our house being repo'd, became unsecure..along with the shortfall for the mortgage.
We actually had very, very little unsecured debt - only £5K or so, so were never suitable for an IVA until we lost our home.