Beko UK Ltd are based in Watford Tel:01923 818121.
They do have a website which seems to be down but I'm sure the above number will sort things out. Do have your full model and serial number to hand before you make any enquiries though.
Just an idea - if the seal's not working properly, you could try wiping it with acetone (nail varnish remover). That'll break down any grease that may have accumulated and once it's perfectly clean again it might work better.