Thanks to Bob B on Whirlpool for pointing this out - https://forums.whirlpool.net.au/forum-replies.cfm?t=2495491&...
To be eligible for this promotion you must not currently have an active PlayStation Plus subscription on your account.
This promotion is only available in the following Stores: Australia, Austria, Bahrain, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Finland, France, Germany, Greece, Hungary, Iceland, India, Ireland, Israel, Italy, Kuwait, Lebanon, Luxembourg, Malta, Netherlands, New Zealand, Norway, Oman, Poland, Portugal, Qatar, Romania, Russia, Saudi Arabia, Slovakia, Slovenia, South Africa, Spain, Sweden, Switzerland, Turkey, UAE, Ukraine, United Kingdom.
Eligible customers can take advantage of this offer by accessing PlayStation Store through a promotional banner or email, signing into their SEN account and purchasing a 12-month PlayStation Plus subscription. This is a limited time offer available on a first come, first served basis as stated in the Terms & Conditions.
Eligible customers who have purchased a 12-month PlayStation Plus subscription will receive an email within 5 to 10 days containing a one-time use voucher code for STAR WARS Battlefront Ultimate Edition on PS4.
You can then redeem this voucher code through PlayStation Store directly on your PS4 or using a web browser.
Applicable Payment Method - Any available payment method.
Closing Date - 30 June at 23.59 (GMT) or the date and time at which the number of Applicable Products sold reaches a limit, whichever comes earlier.
A voucher code to download the game STAR WARS™ Battlefront™ Ultimate Edition free of charge 5 to 10 days after purchase of the Applicable Product.
Voucher Code Expiry Date - 30 June 2018 at 23:59 (GMT).