This is probably the wrong time of the year to tell you Northern Hemisphere folk!
An enquiry to the Flood Company elicited the following:
"It is definitely a good idea to treat the shoes before they get into a bad shape. Penetrol will dry hard but will be flexible, linseed oil tends to stay sticky for longer. We have heard of using Penetrol for shoes and football boots to keep them dry."
It has been hosing down for days so last night in front of the TV I knelt on the floor with a big piece of cardboard protecting the carpet and Penetrol'd shoe after shoe, boot after boot. They are hanging up under cover outside, some of them still rather oily and wet but since today is sunny for a change I expect most of it to soak in.
Just thought I'd pass this on to others who get weary of drying leather shoes and boots. The first experimental pair of old shabby ones treated with a mixture of Penetrol and linseed oil have been good out in the garden. The original coating had worn off and the leather quickly got soaked but after treatment this ceased to be an issue. However we were not keen to risk good footwear till we had found out more. Googling didn't bring up the answer, thus the question direct to the company.
A L P