i am about to purchase a puppie for me and my family.
I have found a breeder that is selling dogs for £550.
what should i expect the dog to have had done .eg worming chipped injections
tail docked this is my first rottweiler and am not sure what i should get for my money any help would be very appreciated thx.

It should certainly be wormed with a document to tell you exactly what regime has been followed with what drug and when to give the next treatment.  All the rest will depend on the age of pup and the individual breeder but I am sure they will be happy to tell you want is planned :)
You should also be given:
A pedigree certificate, probably produced by the breeder, but perhaps printed by the KC.
The KC registration document unless it is still awaited from the KC in which case written confirmation that it has been applied for and will be passed on.
A diet sheet and enough of the puppy food, if not home made, to last for at least a week.
These are the basics in addition many breeders will include written advise about rearing.