Quote - I did a real bad thing... I save a 23 layer psd and it then refused to open... so despite loosing the psd totally (dumb me) I did have the flattened tiff... LESSON LEARNED!

Yeah. been there and done that.

You never realise you've done something bad until it's past too late.

I always try to save multiple versions of things. That practise has saved my skin more than once.