Just read a really interesting article at BBC online. It seems that since the changes in 2006 (sperm donors no longer anonymous) fewer men have been coming forward to donate sperm to sperm banks. This means many fertility clinics are having difficulties, & couples are have to go on waiting lists for sperm.
The article is very interesting and highlights one way the Centre for Reproductive Medicine at Barts Hospital has dealt with the problem, by setting up their own sperm bank
Click on link below to read the article