For what it's worth I'm currently buying 16% protein sow rolls from Duffields for £290 tonne delivered. These are packed in 20kg plastic bags. Minimum 1 tonne delivery. I have had some problems with the rolls going mouldy in the sealed bags. It's not unusual, especially in hot weather, and Duffields have always given me replacement bags on the next order (providing the returned ones are within the use by date). I would strongly advise that you try and find somewhere cool and dry to store your feed
Duffields cover most of East, Central , and Southern England. Their head office is at Saxlingham, near Norwich.
As has been previously mentioned, bulk feed is £50 -60 a tonne cheaper. I've asked several mills about buying in 1 tonne tote bags but none of them seem to offer this