Did Britain consider gas against an invasion?

Did Britain consider using gas against German troops landing during Operation Sea Lion?

Britain considered many ruthless anti-invasion measures, but this exchange does not verify a particular gas plan.

Britain's possible use of gas on landing beaches is considered in the context of a German invasion. British planners examined many ways to defeat such an attack and were prepared to be ruthless. No details here establish a particular chemical-warfare scheme, so the gas proposal remains unverified.