I have read about people having them done but I don't think it's something that people tackle themselves. The labour is apparently a few hundred, good time to consider aftermarket cams at the same time if you're thinking of maybe going down that route later.
Thank you for replying. Im trying to get quotes now as i cannot pressurise the cylinder to keep the valve in place. Not looking good atm as everyone is quoting for a head off job but i dont believe that it is.