From a quick skim through the topics you mention it seems that you have covered all the important aspects. Also, if the building was previously used as a warehouse perhaps some or much of the 'hardware' aspects like fire signage might still be place and of a reasonable standard. If so, this would allow you to concentrate on the organisational aspects you mention.

Will employees have access to a kettle or other means of making hot drinks? Though this might seem a frivolous point it's surely quite an important one as regards wellbeing and morale, especially if the warehouse isn't heated to a great extent.

As david says, a significant hazard is present if there is no suitable segregation of pedestrians and traffic.

If fork trucks are in use, try and map out the site showing lanes for fork trucks and footpaths for staff, inside and outside the warehouse, as well as routes and parking for delivery vehicles and for staff cars. A few zebra crossings may be useful.

Ensure fork truck drivers are inducted, and know rules about speed, reversing, use of horn etc and if there are 'common areas' please ensure there are site rules about who gives way to who (trucks should give way to people). All staff should wear a hi-vis vest. If there are roller/shutter doors make it a rule that no pedestrian enters them (there should be 'wicket' doors for pedestrians) unless they are pulling/pushing a pump truck.

Make sure your racking is inspected regularly, internally and maybe get an inspection company involved, make sure all racking damage and dodgy storage is reported and sorted.

JohnW

and...

Protection against possible arson. All of that wood in a building would make for a huge bonfire. Any flammables or combustibles stored outside of the warehouse? Pallets and the such like.

DaisyMaisy,
Aside from all the good advice already given - especially the notification of insurers - I do have one comment.

Perhaps someone needs to expain to higher management that H&S/risk management should form part of the planing process and MUST be taken into account from Day One. I guess that this new warehouse operation has been in planning for months. Why were you not involved? Why wasn't consderation given to sorting some of this stuff out earlier? If there has been some "ft out" work then that would have been an ideal time to get any saety related matters sorted e.g. barriers where offices or mandoors open onto traffic routes. I would guess it'll be much more difficult to get them installed in a working warehouse!
Phil

thanks all - everything in place regarding PPE and those noted above Lisa. Have tried Phil G re higher management and the need for forward planning but it doesnt happen - we have however highlighted how much work is needed and hope to delay the opening and use until end next week. all other input much appreciated and on the list!

not at all Phil - didnt take it as criticism at all - more like you understand what I am up against!!

thanks all -