S’no Fun...

[Malcolm Parker]

I see how well Martin's doors fit and no longer wonder why I freeze in our RP...but, on the plus side, it is so draughty it never steams up!

I don't think it is a case of how well the doors fit, Michael.  You often see yawning gaps between the top of the door and the roof, also at the front edge of the door.  This is generally due to there being no draught seals fitted around the door panels. These can easily be made and transform the comfort of the car.  For the wide gap at the front edge of the door, you can use wing piping covered in leathercloth.  All you need to do is loosen the door panel, slip the seal under and retighten the panel to grip it in place.  At the top of the door, in addition to the draught seal, I think that originally a fabric 'curtain' about 1/2" deep was fitted under the cover trim around the edge of the head-lining.  My very original 1929 fabric saloon had this in place.
You also get a lot of draught around the gearbox.  On my SWB saloon I have attached a sheet of non-intercellular foam about 4mm thick onto the underside of the cover plate over the starter housing.  I used small bifurcated rivets to fix the foam, which protrudes beyond the metal panel around the starter housing. When fitted in place, the foam compresses to provide a very effective seal and the protruding bit moulds around the starter housing perfectly.  It reduces the draught and also stops fumes and noise coming through from the engine compartment.  I also have a well fitted carpet that helps.  There is often a massive gap between the door panel and the inner cill.  On my saloon I sealed this with a length of Furflex trapped under the edge of the carpet.  I take the view that if you have a saloon, it needs to be comfortable, otherwise you might as well have an open car! 
I drive with the drivers window slightly open and this prevents misting up in most circumstances.  Unlike most modern cars, you can drive an Austin 7 in wet weather with the window slightly open without the rain getting in.