A rather heavy bird sat on it?

some just do. you could try tying it loosly to a straight cane in the hopes that you can retrain it. many plants bend at the junction where the root becomes the stem. there is nothing you can do I am afraid.

Is this 10inch in the open ground or a pot?

Most small plants follow the light so have a look to see if this has all round light or the light is coming from one direction,

If it is in a pot! you could keep turning the pot daily, this may help.

Ive one in my own garden and its about 6/7ft tall ,
my other half is sorting out some pics to go on the blogs tonight and if we can get them on i'll get her to put one of our monkey puzzle.

Thank you Seaburngirl, will try to support it using a cane!
Thank you Dungy, Yes it is in a pot and have rotated it a few times, I await for the pics, ta.
And thank you also to Moon Growe, I'll stop over-feeding our canary!

Lol MG, needed a giggle.

Me too... And we have found our well fed birds can cause the leader stem to bend :-)