Thanks for the tips Carlrich, I was wondering how I was going to repair the wing retainer. My thought was to add a new piece of balsa to the underside of where the existing is fitted, kinda above the battery compartment and use a longer bolt, though I will probably do as you did as it works OK.
I'm hoping to get the straps at my LHS tomorrow, if not from there from Multiplex directly. I will get more than I need and post you some out if your struggling to find them.

I think the crash was mostly caused by me not securing the battery too well, as the plane handled like a shoe once airborne - really reluctant to turn and when it did wouldnt come out, so Im guessing the pack was moving around at the back where its not held down. Next time Im securing it with a foam bung.

I will post here tomorrow if I find some straps, you can PM me your address if you like.