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Sending package to UK
Why don't you use the Post Office - you can a packet through them with on-tracking and insurance if you need it:
http://www.bpost.be/site/fr/residential/parcels/index.html
They also sell cardboard tubes (at least some of them do)
"inexpensive yet reliable"
I'd have to agree with anothermum above. Use the Post Office.
inexpensive and reliable ... hahahahah DON'T use the Belgian post office. Anon - well, that says it all...