If we pay him £4k a week, that's half so it'll be a hell of a push to get him near that.
If for some obscure reason they do release him and give him a payoff, they won't be saving £800k, it'll be nearer £400k if they are to match his lost salary.
I'd imagine part of their reasoning for loaning him to us was to increase his transfer value which i'm sure they feel he did. They were also under pressure from him as he urgently needed game time to enable him to make the Aussie squad.
That pressure is now less and his value has likely increased so i'm baffled as to think why they would pay him to leave.