Welcome Betta246. You will find out so much information here on this forum. Anytime I have any questions related to either my grey named Tango or my macaw named Tiko I first post it here on this forum. The support is phenominal.
I am not sure what 850 UK money means, but I paid $1,200.00 + tax for Tango. Then you need to add in the cost of a cage big enough for the bird, the play pen perch, the toys, and the seeds, nuts, fruits, vegetables, soak and boil, etc. The total initial investment here was right around $2,500.00, and have never regretted this.
A good book to get and read is called "For the Love of Greys" written by Bobbi Brinker. I have read various books and this one has been the best so far. I also want to add that please do your homework in advance. These are precious creatures that deserve you do this. A life changing experience as a previous poster said is exactly the truth. What blessed birds these are.
Ok I am ranting now. A welcome to the forum is all this was supose to be so again welcome to the forum.