I just kept my eye on fleabay and got a full interior same as mine but with no splits in the seats for £100 and it looks a fairly simple job to swap the seat bases over and I may treat it to new seat foam as well.
It took a few months to find one local and in the right colour but they are out there. I did enquire with a upholsterer and they wanted £200 to just sew a patch in if I stripped the seat for them.