mortgage offer issued ,then declined - bank will not give the reason - please help

[WannabeHappyNow]

I've name changed ,as don't want to be outed.

We have applied for mortgage , we had 15% deposit, end of August we received a mortgage offer .Everything was o.k ,then 3 days before exchange they have removed the offer ,and that is were it gets weird - bank has not informed anyone about it. Thanks to our solicitor, we've found out only the day before exchange ,as he called the lender to make sure everything is o.k . It weren't . They haven't send any email ,didn't call or fax anyone. Our broker was unaware of it too. I called the bank ,and I've been told that it has been declined by Head Office ,and they will not give a reason,why it has been removed . We cannot appeal either ,a parents it has been declined by HO.

My question is what do we do now?
When we can apply again? If they ask for what reason this offer has been declined ,what do I tell?
Has anyone came across situation like this?
Will this fuck our credit score in the future?
Broker has appointment with the lender tomorrow ,but I doubt he will find out anything ,as I have called them three times ,they won't tell me anything. Our solicitor has called them too ,with no success.

I'm sorry for the typo ,and for the rambling but I am devastated and can think straight.

Nationwide are notoriously picky lenders, are you sure your broker knows what he is doing ? Our broker advised which lender would be most likely to lend us want we wanted and did paper application to underwriters rather than online, as that can very much be a "computer says no" senario. We are with Santander, everytime we remortgage we just need to log on and pick our new rate, so simple.

Nationwide are awful at the moment. 3 sets of friends had offers pulled immediately before exchange like you and with no reason. One of the friends only wanted to borrow 30% of value of the property and 1.5 x times income. She got a deal with Lloyds in 5 days.

My poor neighbour ended up selling their home for over £100k less than it was worth because Nationwide survey said so. The buyer bought it last summer. She has just sold it again for £200k more than she paid.

Nationwide are truly awful! Find another lender pref via a good broker.