Telephone numbers would be useful but, TBH, most do not encourage direct contact from drivers. However, I have been in a situation of being early, and nearby, and aware that the local Motorway network was ‘screwed’ and they were glad for me to go in early.
Mobile phones. Never been an issue. But most ban their use within the actual warehouse so, common sense dictates that it stays in the vehicle unless needed.
Lock bars and internal straps are not normally an issue for vehicles delivering. Tesco Middleton require bars (and, I would presume, other restraints) to be removed by the driver. Where ‘meat hooks’ are fitted, most will either require them to be strapped forward, or require the driver to unload the trailer with a pallet truck.
Welfare facilities. Rather than asking what they provide. Ask them if they are fully compliant with INDG (whatever). Lucy knows the one. The one that stipulates that they must provide somewhere for a pregnant female to lie down. As well as access to free drinking water. Asda have a number of RDC’s where, although the water out of the machine is free, you first have to insert 20p. 
Which you then can’t get refunded. So you have to buy a drink anyway. 
Therefore. It fails to be free. 
Emergency (Fire etc) procedures. I don’t have a lot of faith in them as they normally stipulate that visiting drivers go to R.V. points. This is fine until the cause of the fire is actually a fridge within a trailer. Which is what took out the old Blakes depot at Warrington. Surely, in the event of a fire, vehicles, and the fuel contained within them, should be removed as rapidly as safety allows. Which is where I have concerns regarding Tesco, Snodland, which is, effectively, built into the base of what I presume to be a former quarry. Surrounded on three sides, by steep inclines and, on the fourth, a lesser incline. Employees have an electronic exit via turnstiles. The barriers are at a height whereby they are not ‘vaultable’. In the event of a serious incident involving fire or chemicals (together with an electrical failure), there would be a need for a vehicle to ‘take out’ a barrier or a section of fencing to enable people to escape ‘en mass’.
Overnight Parking. Although a senior executive for the operating company for Magna Park had a letter published in T&D some years ago pointing out that it was a condition of their lease that operators provide overnight parking for drivers whose hours had had expired, I have been in a position to overhear staff at Asda, Lutterworth, refuse to permit a driver to remain in such circumstances.
If we are going to down that line, then perhaps we should be requesting the details of the company who have ownership of the site and confirming what is stipulated in the Contract?
Rikki. You are into my territory. 
Whilst you are at it. Ask about their attitude towards CPD. (Continuous Professional Development). I’ve heard of a tale about Iceland, Swindon (I think) where the NVQ assessor was classed as a ‘passenger’ and required to sit in the gatehouse for two hours.
If that had been me, then the ‘load’ would not have entered the site. It would have been a case of the ‘Duty Manager’ attending to explain as to why the Company did not support CPD or the load would have been ‘late’ as I’d needed to be dropped off at the nearest railway station, prior to ‘penning’ a letter to the chairman of said company to the relevant effect.
And on the subject of NVQ’s. Where a significant amount of ‘evidence’ can be in an electronic format. Ask as to their attitude to photographic or video capture of the conduct of a candidate whilst ‘on site’. 
I’m sure I’ll think of more.
