When looking at work at home rights you need to be careful of several things.
Firstly, that you take adequate precautions to show that the licence being used is not being used for a greater number than you are licenced for. The simplest way of looking at this is for each staff laptop you allow the same member of staff to have it in a 'home' machine.
Secondly, that you take reasonable precautions to tell staff that they must uninstall software upon leaving the school. This needs to be part of a signed contract to protect yourselves.
Thirdly, where possible you need to make sure that the software has only been installed on the correct machine. This may mean that school staff perform the installation. The school may choose to make a charge of this. (I bet that it would not be free under
BSF!)
Finally ... do not give out original media and original licence documentation. It is possible to build an administrative install with all the relevant information included in the package (serial number, name, company, etc). Whilst this does bundle the whole system into an easily transferable package it also limits the licence code being easily transferred to those not entitled to install or use the software.
Ensure that your supplier is aware that you are using the work at home rights to make sure that the agreement you have with them is not a very specific variation of the various agreements (eg Microsoft Academies that have the Schools Agreement, for those using the SSAT Select Agreement from Ramesys, LA contracts) which may have slightly difference terms. As far as I am aware there should be no issue ... but from word of mouth I have heard a few LAs trying to blag it.