I. Sir Adrian Boult tends to be my 'go-to' conductor for pre-WW2 British composers, & I find him particularly insightful in the music of Vaughan Williams. So, I would consider Boult's EMI recording of the "Fantasia On A Theme By Thomas Tallis" to be essential listening, despite what David Hurwitz has to say about it (that it's "slow", "heavy handed", & lacking in passion and "quite boring". No, I don't think it is, but I suppose it depends on how you view this music, & obviously Boult doesn't think it should sound like Richard Strauss). I also like Sir John Barbirolli's more passionate 1962 account on EMI, too, along with Sir Neville Marriner's old Argo recording (one of two Marriner recordings of this work). Those are my three favorite pre-digital era recordings by English conductors & orchestras.
1. Sir Adrian Boult, London Philharmonic Orchestra, EMI:
1. Sir John Barbirolli, Sinfonia of London & Hallé Orchestra, EMI:
3. Sir Neville Marriner, Academy of St Martin in the Fields, Argo:
II. My two favorite recordings by non-English conductors, both of which Hurwitz likes & strongly recommends, are these two,
1. Constantin Silvestri, Bournemouth Symphony Orchestra:
2. Eugene Ormandy, Philadelphia Orchestra--Ormandy isn't normally one of my favorite conductors (except in Rachmaninov) but he had a great orchestra, & the lush strings of the old 'Philly sound' work well in this music. Though the performance does sound very similiar to Ormandy's Strauss:
(Here are Hurwitz's YT picks:
Repertoire: The BEST Vaughan-Willliams Tallis Fantasia.)
III. Among digital era recordings that come in better sound, I've most liked the following three versions, which I've placed in order of personal preference,
1. Sir Charles Groves, Royal Philharmonic Orchestra, Carlton Classics: This is the great recording of the Fantasia that everyone seems to forget about or not know, and it's digitally recorded:
Fantasia On A Theme By Thomas Tallis
2. Bryden Thomson, London Philharmonic Orchestra, Chandos--I'd consider Thomson to be another underrated conductor of the music of RVW, & IMO, this version is preferable to the digital recordings of this work by Previn, Haitink, Slatkin, etc.):
Fantasia on a Theme by Thomas Tallis
3. Sir Neville Marriner, Academy of St. Martin in the Fields, Philips--Even though I don't like the Fantasia performance here quite as much as the one on Marriner's earlier Argo recording, it's still excellent, and comes in better sound. Plus, there's the added bonus of a very good performance of "In the Fen Country":
Vaughan Williams: In the Fen Country - Symphonic Impression.
Vaughan Williams: Fantasia on a Theme by Thomas Tallis
IV. Most recently (though I don't think that either performance below is in the same league with the ones above),
-- Andrew Manze, Royal Liverpool Philharmonic Orchestra, Onyx--I found this to be an unusual interpretation, but ended up liking it:
Fantasia on a Theme by Thomas Tallis
-- Sir Mark Elder, Hallé Orchestra--I don't know Elders' recording well, but his RVW series has received strong reviews from the British classical rags, so it may be worth considering:
Fantasia on a Theme by Thomas Tallis
Hope that helps.