Sub-frame corrosion

[Pueblo_Boy]

I had an advisory for sub-frame corrosion, and paid someone to rub down the rear frame and apply rust remover. I still got an advisory at the next MOT - "corroded but structural rigidity not significantly reduced"

Recently, I saw a refurbished (4 coats of primer paint) sub-frame for sale at £80, and was tempted to buy it. My question is, what else would I need to buy and replace to make the job worthwhile? Bushes...new suspension arms for sure...what else and how much?

I also have an almost complete old rear sub-frame that I bought two years ago, because I wanted the upper arms off it (I used one). Presumably, this can this be sand-blasted and painted up...or alternatively, my existing sub-frame(s) could be removed and treated to sand-blasting and probably new bushes etc. too.

The MOT mentions both front and rear sub-frames, even though the front was apparently done some years ago. It makes sense I guess to have them both done, but at what cost? I would at the same time get the car underside rustproofed to protect the investment.

All of this will no doubt cost a pretty penny, though I have no idea how much - anybody care to estimate the costs? Or with 156,000 miles on the clock, should I be thinking of selling and investing in one with fewer rust issues? I really like my Tourer, and have made a number of improvements to it, but realise I could easily throw lots more money at it for little return in longevity... Please note I do not have the facility to do any mechanical work myself.

Any sage advice gratefully received.