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But hey if you can recommend any software that allows you to disable internet access by room/computer/session then Ill certainly look at it. Does websense do this?



Yes.

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PS I work in a school...
MONEY IS REALLY TIGHT



Whoa, no need to shout, I ain't deaf yet.

Websense is very expensive, and very complicated so it may not suit you.

Doesn't your local education authority have guidelines or best practices for providing internet access to pupils? I would have thought that would be the best place to look for direction. You should certainly ensure that you are complying with any minimum level of monitoring and control of access.

What you've got now may suit your needs but kids are often surprisingly devious and tricky and the only way to ensure that they cannot bypass the security is to take access control away from the client and manage it on the router / firewall / proxy.

The cheapest solution is to use a proxy, and only allow the proxy computer to access the Internet directly. You then manage client access on the proxy. This works very well in most situations. It only falls down when you need to provide access to protocols which are not supported by the proxy.