Depending on how fast you want it, it can be quite expensive to ship overseas. With USPS, to UK, it can easily be over a hundred dollars if you want it within about a week and the weight is over a few pounds. I usually suggest the 4-6 week method when I sell to overseas folks because it's much much cheaper. If you pay that 100 GBP shipping cost, you should expect to get it pretty fast, or else file a complaint or something.
