Here's the tune from J.Glyn Jones' Cerddi Huw Puw (written originally for his children according to the preface). His notes for this are:

"Fflat Huw Puw ('Huw Pugh's Flat'). Tune: Dydd cyntaf o Awst; JP 92. This tune looks like a fiddler's setting of the insipid tune of Come Jolly Bacchus (early eighteenth century, Ch 658) which appeared, to other words, in The Beggar's Wedding, as the Glorious First of August; whence the Welsh title. I have altered Parry's score slightly regretfully sacrificing some lively top notes, which do better for a fiddle then for a sing-song with sea words. The rhythm of the words follows that of hte music, in violation of footrule prosody. The available rhymes to Huw Puw petered out, and brought the song to an abrupt close

Since Huw Puw's Flat has come into prominence, I had better give a short history. There was such a flat, commemoratedin a dramatic stanza:-

Fflat Huw Puw yn hwylio,
Dafydd Jones yn rhifflio
Huw Puw wrth y llyw
Yn gweiddi Duw a'n helpo

This single episode of a sqall is all that I really know of her. The rest I have invented".

(The references are JP: John Parry's Welsh Harper, 1848 and Ch:Chappell's Popular Music of The Olden Times)

Mick

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X: 1
T:Fflat Huw Puw
M:C
L:1/8
C:J. Glyn Davies
S:Cerddi Huw Puw - J. Glyn Davies
K:A
E|E>F E>D C2 E2|F2 F2 E2 E2|
w:Mae swn yn Mhor-tin-llaen, swn hwy-lie'n cod-i
FG AF G2 B2|AB cd c2 HB>
w:Blocie i gyd yn gwich-ian, Daf-ydd Jones yn gwei-ddi
E|E>F E>D C2 E2|F2 F2 HE2
w:Ni fed-ra'i ar-os gar-tre yn fy myw;
HA2|FG AF GA BA|c2 A2 A2 z2||
w:Rhaid i mi fynd yn llon-gwr iawn ar Fflat Huw Puw
c2 c2 B2 B2|A2 A2 G2 G2|
w:Fflat Huw Puw yn hwyl-io he-no
(FG) AF G2 B>B|AB cd c2 HB>
w:Swn_ cod-i ang-or; mi fyn-a'i fynd i for-io
E|E>F E>D C2 E2|F2 F2 HE2
w:Mi wis-ga'i gap pig gloew tra bydd-a'i byw,
HA2|F>G A>F GA BA|c2 A2 A2 z|]
w:Os ca i fynd yn llong-wr iawn ar Fflat Huw Puw