The spring lockdown brought about unprecedented demand for bbq gas as people bought their first gas bbq's, fire pits and patio heaters. This first time use demand combined with that from the traditional users put massive pressure into the supply chain resulting in a long period of patio gas being sold out. Second lockdown brought a further wave of demand for appliances with customers finding sourcing their first bottle quite challenging.
Based on this, you can get an appreciation of why BBQ gas is only being offered to those with an empty to exchange; quite simply, there isn't a limitless supply of bottles regardless of which brand you choose.
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