OK, the results are in!
I did everything the same as I usually do last night but skipped the curl creme, so I cowashed with XHC banana conditioner and rinsed, then plopped for 2 mins and then put my gel straight on and let it airdry.
Today my hair is... Fine. I would say it feels lighter without the creme but not that the creme makes it heavy, more that without it my curls are less defined and a bit flyaway, it hasn't clumped like it normally would and it looks a bit messier. The curls don't seem to have held as well either despite the gel, although it did dry faster! Also after boasting about how my fringe turned out OK I let it dry badly and it looks daft today, typical!
I wash mine every other day because it just gets flat after that after being under my helmet. It doesn't get greasy BUT that's because before I started cgm I was already sulfate free and had already gone through the horrible transition period where a Dutch braid was my best friend!
Honestly I'm really happy with my cheapo products! I have the tesco gel too but am using up the Eco style first, I think that cost me the most at about 4 quid on amazon! The Boots curl creme is 2 quid tops so it's OK if it doesn't quite work out.
End conclusion of this experiment: I'm going to go back to using the curl creme but am not averse to trying out different ones in future, also I mustn't claim my fringe turned out OK and then let it dry badly 