Boots chemists have a supply issue for lantus 3ml cartridges for opticlik in south east so beware -don't leave your request to last minute. I could only get one box from alternative chemist today.
update - opticlik is being discontinued - getting a new pen tomorrow
The brother is a newly diagnosed and I am an old hat and on a pump however he was recommended a month ago to not use cartridge lantus and use solostar. I was told this in 2010 when I was diagnosed and on pen therapy. Make yourself known to the chemists so that they always remember to order some. The worst thing is when they don't get your stuff in. Many hours have been spent down at the local doctors pestering the people in charge to get the stuff. This may seem pushy but its the only way for them to remember to get your stuff.