Seem to remember a supplier in the Falkirk area called Slotseal (seal to fit in slots!). I'm sure they are still going, just google them. Post them a wee sample of the seal and they will match it.
rdpaterson@dundee.ac.uk
October 2008
Automatic Answer
We may have found other answers which could help you.
howtomendit.com for free repair help, information and advice.
Try fixfault.com to fix windows and doors.