Just came back from my friends place who has all the tools... We got the caps off eventually.. It took a hacksaw, a chisel and a screwdriver to do it.. (what a mission).
STAY AWAY FROM ALUMINIUM DUST CAPS!
(unless you put some kind of grease in them to lubricate)
Could only find one pair of pliers so cannot hold the stem while trying to twist the cap..
Tried heating it with a lighter (Thats all I had) and poured boiling water on it..
Still wont budge..
Its dark out there so I'll try the drilling the top of the cap/ wd40 method tomorrow maybe...
Wanted to check air pressure in tyres, dust caps will not budge, tried pliers and still no luck..
As im using the pliers, the actual rubber valve was twisting as well, so had to stop that as I dont want to damage them..
Any ideas? i dont want to fork out for a set of new tyres...