Hi Lisa
If you are working for an organisation, why aren't these sites enough?
If you are researching intestacies in England & Wales, your remit as a probate researcher is to build a family tree going no further back than the deceased's grandparents. As interesting as it can be, padding out the family story isn't part of the remit.
FindMyPast et all should give you the bmd indexes and censuses.
Use the CWGC site for war deaths if you are having trouble finding deaths in the indexes.
You should also have access to the more recent GRO indexes after 2007, your organisation should have someone who goes to the archives on a regular basis.
You can now search for wills online here
https://probatesearch.service.gov.uk/#willsIf you are trying to locate missing people, the organisation you are working for should provide you with access to one or more of the specialist tracing sites that are available with a subscription.
If you are finding that you don't have the research tools you need, you should speak to someone in your organisation and ask for their input.