I just use a 3lb bag of Munton's plain light DME. I get a nice amber orange color. And that biscuity caramel flavors in the malt. But the flavor will be better with a 20 minute addition & the dry hop. 30 minutes will give some bittering,but at the expense of a lot of the flavor.
It's a British style IPA to start with,having more bittering than American style hop bombs. They are both IPA's,but different beers.
And I've made an IPA out of cooper's cans,but not the IPA one. I used the OS draught can with 3lb of Munton's plain light DME & 6oz of hops,3 varieties.