Some primary sources about Edward I's dealings with the Scottish. Click the bottom-right to read more

1. The Treaty of Salisbury
This source tells us about the negotiations between the Guardians and Edward I’s representatives and the King of Norway over the return of Margaret, Maid of Norway to Scotland.

The King of England faithfully promises that if the lady comes into his hands of custody free and quit of any contract of marriage and betrothal then, when the kingdom of Scotland is completely settled and at peace so that the lady may safely stay there, and when the king of England is requested to do so by the people of Scotland, the king will send the lady to Scotland, as free and quit of all contracts…as when he received her: provided that the good people of Scotland before they receive the lady give proper and adequate guarantee to the king of England that they will in no sense marry the lady except with his decree, agreement and advice of her father the king of Norway.

An excellent resource looking at Edward I and Edward II#s dealings with Scotland HERE

A range of great resources here. Some of them are a bit hard to read but if you get the basic gist of them, that should be fine.
First of all, professor R.R. Davis looks at the background to Edward I in Wales here: LINK

Whilst Dr Ifor Rowlands investigates the process and impact of Edward's conquest of Wales - lots of sources in this one: LINK

A good set of audio clips in which A.D. Carr discusses the career of Llywelyn ap Gruffydd, ‘the Last Prince of Wales’, and in particular Llywelyn’s final uprising against Edward I, and the deaths of Llywelyn and his brother Dafydd. LINK

He then goes on and discusses the impact of the ‘conquest’ of Wales, and Edward I's programme of castle-building. Nancy Edwards describes the planning of Edward's new towns. LINK

Castles Wales provides some good information on Edward's castle building: LINK

An excellent set of image resources about Edward I and Wales: LINK

This thesis sets out to investigate the activities of Edward I and his officials in Scotland during the period from the conquest of 1296 up until the settlement of September/October 1305. To this end, the administration established by the English king in 1296 is discussed to provide a starting-point from which to assess the events of the following decade. Following the renewal of the war in 1297, the investigation centres primarily on the activities of the English garrisons in Scotland in order to establish where, and to what extent, Edward could describe himself as ruler of Scotland. The campaigns of 1297, 1298, 1300, 1301 and 1303-4 form a necessary part of that investigation as the English sought to expand and consolidate their hold in south-west Scotland particularly. As a complement to the above, the administration of Scotland outwith English control – for which there is very little direct evidence – is also considered, as is the role of the fleet, vital to the survival of Edward’s garrisons. The role of these garrisons – which defined the limit and extent of the English administration – is of such importance that an account is then given of the history of each castle held for Edward, however briefly

http://theses.gla.ac.uk/2222/01/1991watsonphd.pdf