Cups clients wont connect

[sysadmin at handsworth.bham.sch.uk]

Fixed!

On all boxes, /etc/cups/cupsd.conf setup as :

<Location />
Order Deny,Allow
Deny From All
Allow From 127.0.0.1
Allow From 10.121.128.*
</Location>

<Location /admin>
AuthType Basic
AuthClass System
Order Deny,Allow
Deny From All
Allow From 127.0.0.1
Allow From 10.121.128.*
</Location>

Browsing On
BrowseProtocols cups
BrowseOrder Deny,Allow
BrowseAllow from @LOCAL
Listen 127.0.0.1:631

In addtion, on the print server /etc/cups/cupsd.conf has
ServerName 10.121.128.8
Listen 10.121.128.8:631

and on all clients, /etc/cups/client.conf has
ServerName 10.121.128.8
included.

Thanks for those kind souls who pointed me in the right direction