RakutenTV (formerly Wuaki TV) are offering any HD movie for 99p. A facebook account is required. The offer states that this is valid for NEW Rakuten customers, however I've been with RakutenTV for a while and have generated 99p codes in former offers and could do so again this time.
So perhaps worth a try even if you're an existing Wuaki/Rakuten TV customer.
The deal link will take you to the Facebook page with the offer. You need to log in to your FB account and then click on the corresponding button to generate your personal code. Valid until 31st July or for the first 3,000 redemptions. After redeeming the code you have 48h to watch the movie if I remember correctly.
Here is the small print:
Final price will be displayed after the voucher is redeemed. Only one redemption per customer. Offer is available in HD quality, valid until 31st July 2017, 11:59pm or until in the limit of 3,000 redemptions is reached. Once you rent a movie, you have 48 hours to watch it. Redemption not available on Iphone/Ipad due to App Store T&C'.
UPDATE on 18/07/2017:
Deal link updated so it directly takes you to the offer.