Hi Firstly I would like to thank you for a great cart and I would very much like to use you cart for various ventues however I am having difficulty in configuring shipping extensions to match uk prices.

I would like to know how I can update the rates relavent to the Royal Mail extension as currently the rates are incorrect, I appreciate that I can change the hard coding from the actual file but I would like to be able to do it from the control panel so that when the rates change we can change them without having to recode the file, in effect a similar function to how the weight based extension works would work well for the different options that are available.

In the royal mail extension the option is missing for special next day delivery and special 9am delivery.

 also is it possible to have it so it looks at the dimensions and weight of the product and stops that option from showing if it exceeds royal mail parameters ie 
Letters have:
 Length  240mm max
 Width  165mm max
 Thickness  5mm max
 Weight  100g max

Large Letters have:
 Length  353mm max
 Width  250mm max
 Thickness  25mm max
 Weight  750g max

Packets have:
 Length  over 353mm (610mm max)
Or
 Width  over 250mm (460mm max)
Or
 Thickness  over 25mm (460mm max)
Or
 Weight  over 750g

and then choose the correct parcel for the dimensions of the product.
this is the uk royal mail site for you to look at royalmail.com/price-finder for the correct prices.

I await your response thanks in advance for your consideration.