From the Hendon & Finchley Times, 19/04/1929, p.8 :

Hampstead F.C. qualified to meet Botwell Mission in the final of the Middlesex Charity Cup by beating Southall in the semi-final on Wednesday. Playing away from home Hampstead beat their opponents by four goals to two, Potter, Moore, Vanner and Shone scoring for Hampstead, and Harvey-Wenham and Clark for Southall.
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From the West Middlesex Gazette, 20/04/1929, p.14 :

Southall were beaten 4-2 by Hampstead at Western-road on Wednesday evening in the semi-final of the Middlesex Charity Cup, a small crowd of 714 (gate receipts £16 11s) witnessed a tame and rather uninteresting game.

Southall had a re-arranged side, which included a reserve forward line, and Hampstead, who also included several reserves, had the advantage in attack. Southall wore black armlets in memory of the late Mr. C. Thomson, who was a vice-president and trustee of the club.

Hampstead had slightly the better of the opening play, and Potter, from a neat pass by Shone, gave them the lead after 20 minutes. Southall later had more of the play, but Hampstead's forwards were more dangerous near goal, and Holding made a fine save when he tipped over a good shot from Potter. The teams changed over without interval, and Holding conceded a corner in saving a shot from Shone. Fifteen minutes after half-time, Moore, from an unmarked position, ran through and beat Holding at close range. Southall attacked strongly, and Wenham reduced the lead by heading through when Smith fisted out a beautiful drive by Bell. In the next minute, however, Vanner put Hampstead further ahead with a shot that went in off the upright. A rally by Southall towards the close ended in Wenham scoring again from a scrimmage, but just before the end Shone shot a fourth goal for Hampstead.