The SAMCO coolant set is very very good and most on here would recommend it. However there have been problems with their induction hoses delaminating and getting sucked into the engine and turbo. Not good!!! and I am not sure if this has been resolved. I would therefore suggest you use standard induction hoses unless someone can confirm SAMCO have solved it.
Some replacement header tanks have a habit of splitting in 2 under pressure along the seam, so beware of ebay offers for this part.
Being relatively close to you, I would also suggest you use Paul Matty as a local source of info and parts as well as those suggested above.
Good luck with the work. Monthly West Midland meets are every 3rd Thursday eve, except this month we are having our Xmas lunch on Sunday 18th, same venue. See this thread
for all the details.