Buy To Let Mortgage

Hi there

I'm looking for advice on how best to approach the following:
Husband and myself have decided to separate amicably and keep the family home for the sake of the 2 children aged 15 & 12.
Current home is worth 450k with 102k Tracker Mortgage with BofSI with 15 years remaining.
He doesn't work and hasn't worked for last 12 years.
Back in 2005 I converted the Garage to a self-contained Granny flat and the rent from this pays for the tracker mortgage which is 600 a month.

The hubby can't afford to move out so I'm looking to purchase a 2nd property.
I have 30k in savings
I have found a 1 bed house not too far from the family home. Its 85k.
I have been refused from BOI as I'm not in my job 2 years.
I'm recently (April) become permanent in the Civil Service and on 41k.
Myself and hubby both agreed that I could purchase the house and he could pay the repayments due which on 60k are around 350 a month. Its the most cost effective option for him as he is unlikely to get any work. So I'm really looking at purchasing a buy to let option.

I have an impeccable Credit Report which I accessed from Irish Credit Bureau and never missed a payment on anything but doesn't seem to count for much!!.

Just feeling deflated at the mo - Has anyone any advice on what bank is best to approach ideally for this buy to let option

I know it doesn't address your key question but ... given your marital situation and the scenario that you outline I would be of the opinion that you might want to consider dealing with at least some of this in the context of an overarching formal judicial separation arrangement.