does anyone know what the limit is on an inheritance before I would have to pay tax on it and if an inheritance was left to both my wife and myself would the limit be doubled?
You can RECEIVE an inheritance of any amount without having to pay tax on it. At least not until you've invested it and started to receive taxable interest.
If any tax is due it will have been paid by the executors before you receive it. The allowance for them is per estate, not per beneficiary.