Here's the list in alphabetical order (I find it easier to read them this way).
OP, you can use a website like this to sort them for you http://alphabetizer.flap.tv/:smiley: HTH

CONTRAST (PS4) £5.79 (PS+ £4.59)
Daylight (PS4) £6.49 (PS+ £4.69)
Defense Grid 2 (PS4) £7.99 (PS+ £4.99)
Don't Starve: Console Edition (PS4) £5.79 (PS+ £4.06)
Dust: An Elysian Tail (PS4) £4.99 (PS+ £3.94)
Escape Goat 2 (PS4) £4.99 (PS+ £3.79)
FEZ (PS4, PS3, PS Vita) £4.99 (PS+ £3.39)
Hand of Fate (PS4) £7.39 (PS+ £5.14)
How to Survive: Storm Warning Edition (PS4) £7.99 (PS+ £4.79)
Mercenary Kings (PS4) £7.39 (PS+ £5.89)
MouseCraft (PS4, PS3, PS Vita) £3.99 (PS+ £3.01)
Never Alone (Kisima Ingitchuna) (PS4) £5.79 (PS+ £3.99)
Nidhogg (PS4, PS Vita) £5.79 (PS+ £4.59)
Outlast (PS4) £7.39 (PS+ £5.84)
Peggle 2 (PS4) £4.99 (PS+ £3.99)
Pure Chess® (PS4) £3.29 (PS+ £2.54)
Pure Chess® Complete Bundle (PS4) £3.29 (PS+ £3.29)
Rogue Legacy (PS4, PS3, PS Vita) £5.79 (PS+ £4.29)
Slender: The Arrival (PS4) £4.99 (PS+ £4.19)
Styx: Master of Shadows (PS4) £11.99 (PS+ £6.99)
Switch Galaxy Ultra (PS4, PS Vita) £4.99 (PS+ £4.09)
Terraria – PlayStation®4 Edition (PS4) £7.99 (PS+ £5.39)
The Bridge (PS4, PS3, PS Vita) £4.99 (PS+ £4.19)
The Golf Club (PS4) £11.99 (PS+ £9.09)
The Stealth Inc 1 & 2 Ultimate-est Edition (PS4, PS3, PS Vita) £7.39 (PS+ £5.29)
The Swapper (PS4, PS3, PS Vita) £6.49 (PS+ £4.69)
The Swindle (PS4, PS3, PS Vita) £6.49 (PS+ £4.69)
Thomas Was Alone (PS4, PS3, PS Vita) £3.99 (PS+ £3.01)
Titan Attacks! (PS4, PS3, PS Vita) £4.99 (PS+ £3.79)
Transistor (PS4) £7.39 (PS+ £5.89)
Trine 2: Complete Story (PS4) £7.39 (PS+ £5.99)
Trine Bundle (PS4) £9.49 (PS+ £6.49)
Trine Enchanted Edition (PS4) £4.99 (PS+ £3.49)
Ultratron (PS4, PS3, PS Vita) £4.99 (PS+ £Free)
Velocity®2X (PS4, PS Vita) £6.49 (PS+ £4.54)

Some good deals there, but I seem to have most of them.

Seems to be always the same games on sale, nothing too great but heat added.

I have never tried ps+. Thinking of taking the free 14 day trial. Does anyone know if you can do this, purchase ps+ price games, and then cancel ps+ within the trial period and still keep the games?

​Yes, was referring to the ps+ discounted titles. Truth be told, I don't know what an IGC title is?

IGC are the free games you get each month. You can download and play them when subscription is active but when your subscription goes the games won't work. once you resubscribe they will all be playable again.

​IGC is the instant game collection that you get each month free with Ps plus. they are yours to download and keep as long as you have a active subscription. if your subscription runs out you cannot play them. if you get the 14 day trial then you should be fine to pay the discounted price and keep the other games. the IGC games are in a separate place on the pan store away from the summer sale.

Thank you for your advice

Heat for The Golf Club - it's been cheaper on the Canada store but I think it's the cheapest it's been on the UK store.
Game will price-match CEX on my physical copy so I can make a few bob on that (especially, using O2 credit)