Husband and wife 85k each? Honestly though the chances of an unseen problem of the magnitude to sink a major financial institution happening this side of November are very slim indeed.
Also you should be able to pay off £14k of your mortgage without penalty now so that reduces the amount too. If you have savings of your own already use that to oat the 14k down.
Assuming the balance over the mortgage amount will be savings then an ISA for you and you wife if married would use another £40k.
So £220k less £14k to mortgage now leaves £206k. Less two isas leaves £166k which would mean only needing two institutions or 85k each for husband and wife in the same institution