They're are a few sites around like this http://www.ironmongerydirect.co.uk/products/seals_for_doors_and_windows but I fear your going to have a lot of searching to find exactly what you want.
Have you considered a secondary seal for the time being, just to keep the draft out until you find what your looking for?
If you need to find a tradesperson to get your job done, please try our local search below,
or if you are doing it yourself you can find suppliers local to you.
Select the supplier or trade you require, enter your location to begin your search.
Please select a service and enter a location to continue...
Are you a trade or supplier? You can create your listing free at DIYnot Local