You can download the Jazz Services logo in colour or black or white and at two different resolutions. The 72dpi version is best for use on a website, the 300dpi is the one you should use for print publicity:
Download Black & White Logo 72dpi
Download Black & White Logo 300dpi
If you are using the logos for publicity relating to the National Touring Support Scheme, you should also include the logo of Arts Council England, who fund the programme. You can download their logos in various formats from their website. The same applies to the PRS for Music Foundation; their logos are also available via their website.