Sorry this is a bit late - I saw this and thought "oh, someone's bound to say 'yeah I've done this'"

Anyway, you can work out the rough cost by weighing 7 records and then going to http://www.royalmail.com/ - click "send mail overseas" then find the weight in the middle column. This is an pretty accurate guide - it doesn't matter where in the UK it is posted.

I'm not sure about insurance - might add a few £.

Gareth