If you are AVIOS poor then consider boosting them via Tesco etc.
As it stands, you could do a part AVIOS / Part Cash redemption.
10,000 AVIOS + £90 gets you into CE (+ RFS Fees)
As opposed to 9,000 AVIOS (+RFS Fees) for a redemption in economy.
The CE Benefits....
3" more leg room than if you are stuck down the back, unless you are very unlucky and end up on a former BMI plane.
Middle seat free.
Lounge access at all four airports
Band 3 catering on the CPH route.
Extra baggage if you need it
ETC etc etc.
For an extra £45 each way I would bite your arm off.....