Hi Dan,
This is what I went off
split up the hops evenly into three additions
15g Amarillo 10g cascade (15min, 1min, dry hop)
Bring 5L of water to the boil, turn off the heat and add 500g Light Dry Malt Extract, mix thoroughly.
Return to the boil for 5min, add 15 min addition of hops, boil for...