Thank you Richard-but it turns out the next bit is way above my skill grade.
I'll just finish off the pictures of the black stuff first.
Tugging, stretching and gluing...and all done
Now on to those seats.
I finally found a shade of vinyl that although not the best match to the original I liked it. It was also a 12.5m roll end for £80 which was the clincher. It's called Biscuit and I'm told its a shade Jagaur used.
I mentioned earlier that I'm no seamstress but the posts by Garry (visualfx) of his recovered seats gave me the inspiration to have another go. They say "a bad workman blames his tools" well...last time I used a borrowed domestic sewing machine. I checked out youtube and learned I needed a beefier machine with "walking foot needle feed"?? So I trawled e-bay and found a used one at an affordable price. My plan is to use it then get it back on e-bay to recoup some/most/all of its cost.
The seat frames needed some repair (detatched captive nuts, rust) and the foam of the later Recaro's needed work too. The later Recaro's are the first to be done. These will likely be in the car the most but are ultimately not that important. They are going to be my steep learning curve.
They were stripped and coated
The base had an extending front edge. I've always thought these were a pointless gismo so its getting binned.
I'm only keeping the foam of the bolsters, the seat pad and back rest will get new firmer stuff. I had to repair the bolsters by plugging and gluing the divots and tears. I then covered them in a thin scrim foam to smooth things over.
I used the old covers as templates but with the previous results being baggy a bit of guess tweaking happened. I think I had a spot of beginners luck.
With a new lumber support
and foam cut for the back rest
The internal curves came out alright
the external curves were abit wavy in places.
This was a problem on the seat bases. The rounded nose of the sides was tight and I couldn't get the vinyl to sit right. I had 2 goes and the second was no better. I had a third go and used piping on the seam, this helped the vinyl stay smooth on the curve.
I didn't have enough vinyl to redo the upper part with piping if I was going to do the standard seats too. So I'm living with mis-matched seams on these

I keep telling myself these are just the practice anyway!
The new foam for the base is angular and over long, but once the cover is pulled tight it rounds the front edge quite well.
The posts for the headrests are wider apart than the standard seats. This is a shame because I would have just done the peanut type ones and used them on both types of seat. So although these are a bit Bodie & Doyle they have been done too.
The rears seat covers and door cards are done so just the two standard seats to go. I have just enough vinyl left (I think)