The second time yes, the first time was 1911-1915. It makes good sense to have Chamberlain involved, he had been involved for so long. Much is made about his "peace in our time" agreement, but he was doing his job buying time, the aircraft of fighter command, bomber command and things like Chain Home and the Dowding system were all created on his watch. In my opinion history gives him a bad rap, he was a seriously ill man doing the best he could in an impossible situation. everything in UK military development after 1935 he had a hand in 1935-37 as Chancellor (finance minister) and 1937 onwards as Prime Minister.
from wiki
Defence spending had been heavily cut in Chamberlain's early budgets.
[62] By 1935, faced with a resurgent Germany under Hitler's leadership (see
German re-armament), he was convinced of the need for rearmament.
[63] Chamberlain especially urged the strengthening of the
Royal Air Force, realising that Britain's historical bulwark, the
English Channel, was no defence against air power.
[64]
In 1935, MacDonald stood down as Prime Minister, and Baldwin became Prime Minister for the third time.
[65] In the
1935 general election, the Conservative-dominated National Government lost 90 seats from its massive 1931 majority, but still retained an overwhelming majority of 255 in the House of Commons. During the campaign, deputy Labour leader
Arthur Greenwood had attacked Chamberlain for spending money on rearmament, saying that the rearmament policy was "the merest scaremongering; disgraceful in a statesman of Mr Chamberlain's responsible position, to suggest that more millions of money needed to be spent on armaments."
[66]