Bought a Flymo Scirocco 3000 for £5 as it was in very good condition except for missing the bag.
I knew the bag would be too expensive so I made an adapter that a hessian sand bag could be attached to with just a velcro strap wrapped around for quick easy emptying.
Worked fine for me so I hope it helps other people too.
You are welcome to make changes to improve on it and please let me know if you do.