i try not to use wd40, unless to free off seized metal parts.
Ptfe based spray i find ok for moving plastics.
Grease from the tub is good for other applications but a word of warning using the pound shop aerosol style grease.
I believe it is petroleum based, i had an electric black and decker strimmer in for repair, the one with the moving plastic swivel head. stripped - found the bad cable, thought i would clean up the motor and commutator etc whilst in there.
All went well, then i thought after reassembly the head plastics felt a bit rough when twisting and locking into required position, a liberal spray of this grease into the moving plastics well sorted it.....
However, as i suspect it is petroleum based (smells like it to me ) it produced a highly flammable vapour in the head assembly which isnt good with the slightest spark from the motor brushes....
This one exploded as i tested the unit, quite a bang for a small amount of spray grease.
Very funny looking back 
Hello again, Just taken your advice and placed an order for this product 11 50 pm on 15/11/19, it will arrive Sunday 16/11/19 - Good old amazon prime (free trial period of course) no annual paid subscriptions here :)
Not sure on price as I had 15 minutes to place the order and I bought other stuff as well, including the MV recommendation High performance Silicone Lubricant as used by MV (just to cover my bases).
Memo to self - avoid buying stull online after you have had two tins of 8% K cider as you tend to get carried away :)
Ah well, it's only money, you cannot take it with you. Catch you later. Jim.