All pretty muuch straight forward mate, easy enough too. Not sure on price but not the most expensive parts in the world, and all common things to go on any car really. Something to negotiate on price with if none have been done.
12 month ticket is a must... the only way you will be reassured.
rear arm bushes will be the most expensive the common issue is the bolts were never greased by ford so removal can be impossible meaning new arms with bushes the rear subframe needs dropped to do this and a 4 wheel alignment done so budget £250-£350 for that job when it says they are deteriorated in my experience they are almost shot a decent tight corner is enough to seperate the bush from the steel bolt a 12 month ticket means nothing as far as the rear bushes are concerned i had a 12 month ticket on my old mk1 and within 3 months had to have the rear bushes replaced
the rear bushes can be almost gone but if they dont move that much its an advisory however it takes a lot of force to move them so any mot inspector wont get any or little movement out of them but when thats translated into cornering force they can move quite a bit
With regards to the rear bushes, when the time comes (if its not already been rectified) these are going to be a nightmare.. the bolts seize into the sleeves of the bush meaning they are very difficult to remove and the subframe usually needs to be removed from the car.
an mot inspector will use a pry bar to see what play is in the bushes, you will be suprised how easy it is to make the bushes move around
the springs in this case should be replaced at the same time as doing the bushes as the springs on the focus are not the easiest to remove/refit either.
depending on the state of the exhaust, new brackets can be made/fitted instead of replacing sections.
so 2 of the 3 jobs are not easy or straight forward
Its not a big job really.
As for those saying 'must have 12 months ticket' - You are very trusting, i have bought cars that came with a fresh MOT but were clearly failures.