^^^^^
Excellent points there
However he doesn't need Enterprise level solutions for every part of his set up.
I think that depends on how big / busy the warehouse is

.
Without specifics, as mentioned, it is hard to narrow it down but at least he now has some more options and can weigh up the potential losses against costs.
If there is a risk of loosing 100,000 GBP / day for an outage due to lost sales etc then spending a fair bit to hedge against an outage would be reasonible but then if he is only looking at maybe 1,000 GBP then 5 cheap PC's (3 POS, 1 'Server' and 1 admin) connected by home plugs with an external hard drive for off site backup and a ventilated 'server / storeroom' would be reasonible. Have the ADSL connection come in to a router with firewall, onto a switch and another homeplug.
Ok pics are easier. Simple, cheap suggestion;
Requirements;
4 Desktop PC's - 2,000 (500 each)
2 servers - 4,000
2 switches - 30
1 Network MFD (Scan / print / photocopy / fax) - 200
1 standard MFD - 140
ADSL Modem with Firewall - 25
4 Homeplugs - 210
4 Network cables (cat 5e) - 8
1 Backup external HDD - 100
Total (very rough figures): 6713 (excl setup costs / any server location modifications).
RB