Didn't know one could get a 203 convertable??
208/9 perhaps?
In the boot on the n/s,remove the panel, undo the 5mm allen brass screw a couple of turns, next to that theres a round pull and turn knob, on the o/s theres a small cut out in the trim, there your find the other valve, pull and turn, now you can put the pull straps in the tool kit around the hinges on the rear cover panel, lift this back as you pull, this will lift the panel up and you can now fold the roof away, push the valves back into the locked state and try the roof, if that dont work, on top of the screen theres a mico switch that sticks, o/s above the screen!! try flicking that and re-try!!!
Thinking as summer is due sometime soon, i will do a write up in diy for the range!!
Summer is here...... It's all about location
Look forward to the write up. I'm sure it'll prove handy in the longer term.
Thanks for the quick responses.