I'm in the same boat - Wright's Swallow (W3SW I think) is in the post to me:
I had a look round for how to conserve it.
Turns out I've already got some Lexol, but Brooks do a "Brooks Saddle Maintenance Kit" for around £10 which has 25g of Proofide and possibly more important the Brooks tension spanner.
Since Wright's was owned by Brooks I'm guessing the same tension spanner will work.
I'm guessing Proofide is the correct approach, unless I find it has issues when I get it.
Edit: here's a link for the kit
https://www.sjscycles.co.uk/saddles/...intenance-kit/