Quorum for votes in the House of Commons, 40.
Quorum for votes in the House of Lords, 30.
So respectively votes of 21 and 16 are needed for a motion to pass, this is for legislation which affects the UK. This is the level at which our politicians think it is ok for them to make decisions on our behalf.
2015 general election, numbers (wikipedia); Overall turnout 66.1%; Conservatives 11.3M votes, 36.9% of the cast votes (~28% of electorate)
Now compare this with what they are proposing for the unions, double standards from our elected lords and masters, yeah. Not surprised at all.