Pay day loan complaint not upheld by the Financial Ombudsman - Should I appeal?

Higsonbear1

I'm wondering if anyone can suggest something I've missed re putting a complaint in to the Financial Ombudsman Services about Payday loans and whether once a decision has been made to them, it is worth appealing for a final decision?
I've been helping my partner claim back payday loans he took out between 2014-2017.  He had a lot!  He's successfully claimed back interest from Wonga and safetynet credit, but we have been trying to claim back for 6 loans he had with Mr Lender, and finally escalated to the Financial Ombudsman Service. 
They have turned down his claim on the basis that they "think it is reasonable for a lender's checks to be less thorough in terms of how much information it gathers and what it does to verify that information in the early stages of a lending relationship" and that with later loans "Mr Lender should’ve taken steps to build a more detailed picture of your financial situation. But I haven’t seen anything in the information provided which suggests the lender would’ve known that you wouldn’t have been able to sustainably make the repayments you needed to for these loans"
My partner sent evidence of 2014-2017 bank account, credit score, plus the loans information to support his claim - his bank account shows payments in just one month to Wageday Advance, Wonga, Mr Lender, Safetynet and Payday UK Loans - which I would have thought indicated that he was in trouble and a simple credit check would have been sufficient to show that he wasn't in a position to repay these loans (hence the claim of irresponsible lending).  His credit score by this point was down to 34!
Any suggestions gratefully received!

On an aside, my partner also has a claim in with Mr Money, but they successfully managed to draw out responding (5 months) until they had decided to go into a credit and court approved scheme, so looking forward to another Wonga-like payout there!

[Deleted User]

They wouldn't have looked at his credit score of 34 even if he told them at the time, but at his existing borrowing.  So you would at least need to look at what debts were appearing on which credit files.  It's a question of which files the lender checked. They may not have had sight of them.