But only after they (sorry the English - not Scots who were almost always allied to the French) were kicked out of France at the end of 100years war in 15th Century and found easier, more profitable prey in the New World and the East.
Chamberlain was in some sense was only trying to perpetuate this long held British policy of supporting the weaker party\ies to prevent any dominant power taking control of the Continent, whether this was Louis XIV, Napoleon, Philip of Spain, Stalin or Hitler.
The problem in 1939 was that there were two equally nasty, very powerful regimes, Germany and Russia equally capable of dominating the Continent.
For ideological reasons the British Government could never quite bring itself to ally with Stalin until it was too late.
The Soviet Foreign Minister Litvinov had been working hard to bring about a meaningful anti-Nazi Alliance but with his fall and replacement by Molotov in May 1939, Stalin had virtually given up on the Anglo-French.
By the time that Poland came into the picture it would have taken a lot of concrete proof to get him to ally himself to the British. One can only imagine his disgust when the British informed the Russians in the meeetings in August 1939 that they could contribute 2 Divisions to fight against Germany (the Russians thought this was a mis-translation and asked for it to be verified).
Well,that's ignoring the fact that Stalin never would join an alliance against Britain (why should he ?) and that Britain and France also did not want an alliance with Stalin (why should they ?)
Britain and France wanted the statu quo,and an alliance with the SU would endanger the statu quo,besides ,Stalin only would be usefull if Poland was defeated,and Germany had a common border with the SU .
And,for Stalin,Hitler only would be dangerous,if Poland was defeated(the common border),but,without the Molotow-Ribbentrop pact,an attack on Poland was impossible .
Litwinof had not been workig hard to constitute an anti-nazi alliance,he had been working hard to prevent a French-British-German alliance against the SU.
Since 1933,Hitlerwas parading as the defender of the western civilisation against the bolchevic danger,the reply of Stalin was to present the SU as a liberal democracy,defending peace against fascism .And,for this,Litwinof was the ideal man :he spoke French,was dressed as a western politician,and could do blahblah for hours about democracy,peace,the covenant,etc.Litvinof could tell clichés till the cows were dancing on the ice and give the impression that he believed them..He could be considered by the western politicians (experts in blahblah about democracy,peace,the covenant,etc)as one of us .No western politician would consider Molotov as one of us .