Hugely disappointing...
I bought this on DVD and was expecting to sit back and watch a British classic.
But far from it. It was below average stuff and the story never really got passed some toxic material being dumped and people infected.
I also think Ian Bannen was miscast. It's hard to see him as a right thinking doctor, when he displays this rather weird persona, particularly when he raises his voice.
Who can forget him in Fright (1971)...
I think if a different actor had been cast, such as Ian Ogilvy, who I believe was making a lot of horror appearances during this time, then the film might have been slightly better.
Having that said, the story was weak, and there were limited action and scares - if none at all.
Only a 4.5/10 from me.