Alternatively, drop the whole heater unit out and maybe there's some scope for getting a hand into the scuttle area via the fresh air intake hole (if you're a bit agile that is ). Are you sure there's not an emergency pull cable already (like the engine cover one)? I'll have a look at mine over the weekend... But it's not that easy and might cause a few :bang: on the first few attempts. What you need is a piece of 3mm fencing wire or a good old wire coat hanger. Bend the end over at 90 degrees for about 12mm - no need for more than this as the back of catch is against body and you'll just loose leverage. Bend the wire with a slight curve as per pictures and turn over other end after about 48cm - this give you some idea of how far you need to pass the wire into the scuttle and what way the hooked end is pointing. Poke the wire through the RIGHT side scuttle grille about 4 diamonds from front edge and 4 from outer most edge. When the end of wire is about inline with outer edge of grille then the hook end is about the right place in centre of catch (about 48cm ) the place to hook is about 3cm up from the scuttle bottom - you'll need to give it a fair pull, but if there's no give at all, it's likely you've hooked something other than the lever. You can put a bit of pressure on the grille to minimise any chance of it breaking but worse case you'll just put a rub mark in it. Good luck 
