Intelligent Ultrasound Takeover Rumours (IUG)

Sorry if I am asking a stupid question here but as 54.6% of some shareholders & directors have approved this deal if a third party happened to bid for the whole company would the "irrevocable" mean just that or would the circumstances have changed so much that a different bid would/could be considered ? I know a bit about the takeover code to realise that there are a lot of arcane clauses in it & I wondered if anyone here knew for sure what the answer would be ?