Zener you could try some of these. I don't know what you've got, so any repetitions I do apologise:
For me part of the interest in baroque is the use of the voice. From Tony's box sets these look interesting:
An interesting baroque opera:
Gluck Armide, Palmer / City Of London Sinfonia / Hikox, HMV dig 3xLP, some cover fading & wear, vinyl mint.
Some rather nice Handel
Handel Ariodante, Baker / ECO / Leppard, Philips 4xLP.Handel Solomon, Watkinson / English Baroque Soloists / Gardiner, Philips 3xLP
Some interesting single LP's as well:
A Bach cantata, one of the things he did best:
J.S. Bach Bauern-Kantate, Concentus Musicus Wien / Harnoncourt, Telefunken, gf, insert.
The harpsichord, love it or loathe it's one of the key instruments of the period
J.S. Bach / Scarlatti Partia in B Min BWV 831 / Seven Harpsichord Sonatas, George Malcolm, Three Centuries
I think you might like this:
Corette Concerto for Flute & Harpsichord / For Flute / Sonata for Harpsichord and Violin, Mainz Chamber Orchestra / Kehr, deep-groove Vox Turnabout, one slight mark
If you haven't got these they are well worth a punt:
Handel Concerti Grossi OP3, Das Collegium Aureum, 1968 Swiss Ex Libris 2xLP, gf, very nice item £4.50.
I'm a big fan of Scarlatti, he wrote some beautiful music:
Scarlatti Sinfonias 6-11, Cantilena / Shepherd, RCA
Teleman in his day was bigger than Bach, well worth a listen:
Telemann Overture In C / Violin & Trumpet Concerto / Oboe Concerto, Kolner Kammerorchester / Muller-Bruhl, 60s Swiss Ex Libris, some laminate lifting and crease to flip-back.
Telemann / Tartini / Reichardt Violin Concertos, Kussmaul / Capella Clememtina / Muhler-Bruhl, Philips.
Some nice Vivaldi, suits you sir:
Vivaldi Concerti: Flute OP8 No 5, 6, 7, 8, 9, 10, 11 & 12 from Trial or Harmony & Invention / Flute Concerto RV429 / Cello Concerto RV424, Standage, Preston, Pleeth / English Concert / Pinnock, CRD 2xLP, gf (some cover wear) £4.50.
If you haven't got a four seasons, Tony's got a few, I'd pick one of those up too!
Also some odds and sods, baroque comes like that sometimes:
Maurice Andre nice Swiss LP on EX Libris featuring the great trumpeter playing works by Vivaldi, Albinoni, Tartini and Stoezel.
Dan Smithers - The Trumpet Shall Sound, Clarion Consort featuring works by Purcell, Blow, Morley, Handel, Dowland etc, Philips.
This looks wonderful, and could be a great introduction to early baroque:
Venetian Festival Music (Gabrieli / Scheidt / Schutz), Bach Choir, Wilbraham Brass Society, Kings College Choir / Willcocks, HMV
Enjoy