Well this morning Kipper found one of my asthma inhalers (active ingredient terbutaline sulfate) and chewed it up. I don't think he swallowed any plastic but I phoned the vet to see what they said. Apparently it's used in animal medication in low doses - but his heart rate is very high so I’ve brought him in. They’re concerned about his high heart rate and he’s definitely not comfy, so they’ve taken him off for bloods (looking at potassium levels), blood pressure and to check with the poison line. I’m in the waiting room kicking myself and keeping my fingers crossed 
Hope Kipper is ok x