DORSET & Wilts Under 18 defeated Buckinghamshire 52-5 at Aylesbury RFC.
The Twin Counties finished top of the Southern section and equal top in the South West.
No 8 Ben Harris (Bournemouth) drove over to open the scoring after 10 minutes.
Chippenham's Alex Gibbon increased the lead shortly afterwards with a try.
A Simon Whatling penalty and a further try by Wootton Bassett's Barry John Chapman gave them a comfortable lead at half-time.
Twin Counties took full control in the second half with tries from Mike Pingavelli and George Billet (Bournemouth).
David Martin also crossed and Gibbon scored twice to complete his hat-trick. Whatling added a try and two conversions.
Dorset and Wilts head the South West Counties representation with nine of the squad have been invited to take part in trials at Clifton College, Bristol on Saturday.
SELECTIONS: Hicks (Newbury), Chapman & Saville (Wootton Bassett) Whatling & Martin (Bath) Abbot, Billett and Denholm (Bournemouth) and Alford (Chippenham).
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