I put some stop leak oil in my rack but it doesn't seem to have made any real difference. Given the value of the car I thought I may as well give replacing the rack ago my self.

 

I have found this helpful video about replacing it on a mk4 golf. Is it a similar job and does anyone have any tips? 

 

It is a similar job, I've done racks on Golfs and Boras but not on a Fabia however the principle is the same.

Consider investing a little in the VW tool set that allows removal and refitting of the subframe-plus-consoles without losing the alignment of the consoles relative to the chassis:

VAG Subframe Locating Pin Set 4 Pc Subframe Alignment Tool Golf Audi Polo 6189 | eBay

I think that's the right tool, but double check before buying.

 

The point is that the two relevant holes on each console that the M12 bolts go through to hold it in place on the chassis have 17mm clearance holes. This is how the front alignment is set up in the factory, by the waggle room within those oversize holes. 

I haven't done the job but I think the idea is that you remove the M12 bolts - one at a time - and replace with one of these, which  when tightened up gives a 'dowel' effectively for the refitting of the consoles.

When refitting you slide the consoles up onto these dowels, and remove one at a time to replace with the bolt.  The fatter parts of the tool can slide relative to the thread axis, which is how they fix the original positions when tightened up.