Advise you strongly to avoid it.
Really, if you want commercial, go for SME, local enterprises.
Any big company, ESPECIALLY Tesco, will simply get you dependent on them (give you more work, get you to overstretch and get into debt) then, when you can't do without them, they'll renegotiate the price down.
They don't care. If they put you out of business, there's always some other mug who'll take them on.