No Postage charge

Hi,
I'm trying to set up my cart but i have a little problem.
I will be running a physical shop as well as online store so on occasions I imagine clients will order online to get the internet prices but will choose to pick the products up from the store. However if they order online and the value is under the £100 necessary for free delivery the program insists they take a delivery option.
Can I set up a client collection option that would attract no delivery charge?
And if so How?
Cheers

I just went through the same thing over the weekend. I didn't have your exact free shipping issue, but there is some similarity.

I used Qphoric's offline credit card module and am running all orders through the POS in the store. I set up a In-store Pickup option for shipping and for payment. Send me a PM if you want to see the store URL.

So you want a "Pickup" option.
You could clone the free shipping module and rename it to pickup
Follow my "How to duplicate a module" tutorial

See this topic. I have attached 2 solutions for store pickup option.