The gases are contained in the pipes which take coolant around the freezer, the pipes dont generally travel under the freezer but come off the compressor at the back inside and up and down the elements you see on the shelves.
If gases have escaped over night they should have dissipated by now anyway, but leaving the door open for an hour would be sufficient to circulate the air.
Based on the spec of Bush freezer you have, the fact the plug at best would only have pieced the bottom of the freezer by a few cm, I do not think you have anything to worry about, but you may find some condensation\water forming under the freezer as you probably have damaged the insulation.
To check if the gas has escaped the quickest way is to turn the freezer on, if it gets cold the gas has not escaped, as it needs to be under pressure for it to cool the freezer, and turning it on is unlikely to to result any more gas being emitted even if there was a leak.
Please let me know if you need anything clarified.
Please give me a few minutes to look up the category of the gas' used on COSHH
I can confirm the freezer doesnt contain CFC/HFC gasses, I am just waiting to find out from my colleague what was used.The gas used will be classified as poisonous \ harmful, the general rule of thumb is to treat refrigeration gas exposure as if it was Freon.
Moderate exposure (which would be the case in you situation) would give symptoms of
The fridge spec provided shows the gas used is R600 (a widely used refrigeration gas), the safety sheet for this product can be found here.
If you suffer from any of the symptoms listed above its suggested you get some fresh air, and contact NHS24 by dialling 111 to obtain medical advise.
Please let me know if you need any further assistance, or anything clarified.
So I may close the case please rate the service received.
I havent heard back from you in the last few days, and just wanted to check if you still require assistance, I would appreciate it if you could rate the service received.