Hi guys, thanks for the replies, I've just woken up so will write a better reply soon to answer some questions.
I never mentioned what our spring rates were or the fact that they are progressive which isn't what we want I'm guessing?
Roy, I'll pop out this morning and grab a rear Cusco sway bar.
For the fact that the springs are progressive and that we don't mind coughing up for some replacement Eibach springs should we just do it, if so does anyone want to throw out some numbers?
This is what's written on our springs which for the life of us we couldn't work out what they meant.
Rear 'Merwede Progressive 250 49 98'
Front '25 250 59 118'
We then emailed Merwede to hopefully get some answers, this is the response email (I've tried to add the conversions in red)