thoughts on these MGC items

[badgecollector]

hi all
firstly sorry but i dont have pics off the rear
do the badges look ok from the front?
the cap badge has a slider, the collars have lugs. are they collars as they are being offered as arm badges?
what period are these trade patches? are they WW1?

also, im asuming these are British but would any of these have been worn by Australian troops?

lots of questions so thanks in advance
BC