Why have William Hills odd not changed yet?

Why have William Hills odd not changed yet?
The opinions polls show labour are up to just 6 points behind the tories. That is hung parliament territory. Yet William Hill have not changed their odds so far from 1.5, which they had about a week ago, yet labours odds have been lowered.
Go on William Hill give me a chance.
I understand William Hill are a serious business. But no fair. Give me chance William Hill. LOL.
No offense to William, Hill that is just my view. I think you should increase the tories odds.
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