If you want a larger loaf (like the one pictured) then double the recipe ingredients other than the eggs- you will require 5. Bake for 25-30 minutes, until a knife comes out of the centre of the loaf clean.
The best way to mill linseed it is either in a coffee grinder (I bought one from The Range a couple of yrs ago for £10 and it has seen me through many many loaves of bread and many ground nut flours). Otherwise, something similar to a nutribullet which has a milling function, or a high speed blender should do the trick.
You just need it to be like a coarse flour. You can buy milled linseed ( The Grape Tree sells a milled variety, although it is a little more expensive than just buying the whole seed variety and then just doing it yourself. But if it saves time and you have the money, then cut out the milling man and just buy the milled variety! ).
The Loaf tin I used to bake this bread is 19cm (long) x 9cm (wide) x 7 cm (deep)
I have found some similar options on Amazon:
Silicone loaf tinThis one looks amazing and I have just bought it myself - I am a big fan of baking with silicone as it's much easier and generally doesn't require much greasing / if any.
Traditional loaf tin A more affordable loaf tin.