Q1: What is the connotation of the below sentence I highlight in blue?
Men who believe that our troops abroad need more than fine words to protect them.
Politicians tend to talk a lot about doing things but often don't actually do much. The sentence implies that if the politicians should put more effort into making sure soldiers have good equipment as they do talking about it.
Q2: red silk socialist bustier = Labour party's uniform?
Red is the socialist colour but silk is generally worn by the wealthier. So they are ot really "of the people"
Q3: Eureka= I find it?
Q4: tweedy embrace = hints David Cameron is from Scotland? Scots wear tweedy, right?
No it just means he is well off and enjoys country pursuits like shooting and fishing. The country "gentlemen" wears tweed.