Big Deposit, Bad credit

Hi all

My girlfriend and I are looking to buy her grandparents house as they are now both deceased. The estate is split between my girlfriends father and her two aunties and the house has been valued 230k - 240k. My girlfriends father is going to lend us his part of the estate to put down as a deposit. (about 80k)

We both have poor credit ratings and have a household income of 30k. Will have to use her parents as guarantors. They own two properties and have a household income of around 50k a year. They also have 100k in an account to use against the guarantor mortgage if we are successful.

We have applied to two mortgages brokers 'equity finance' and 'bower'. They have both said they cant deal with us because our credit is so poor.

We seem so close to getting this mortgage but again so far away.

Is there a guarantor mortgage which will go on the guarantors credit score and not ours?

Is there a mortgage broker out there that is more lenient towards people with poor credit ?

If we could unlock the 100k in my girlfriends parents account and add it to the 80k (180k) would a deposit this big improve our chances ?

Any advice would be greatly appreciated.

Cornishblue