CG,
Had a look on the internet and here are the results, might give it a whirl myself. Hope it helps. p.s if you find any hot spots dont forget to P.M me and let me know

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RIVER VVRNWY - LLANYMYNECH
Location; Situated at Great Dufford Farm
Owner Permit; Montgomery A.A.
Availability; Day and Season tickets1 mile of fishing on right bank
Tel; 01686 629615
Fish Species; Salmon, Brown trout, Chub, Barbel, Grayling
Additional information; Close season applies.
RIVER VVRNWY - LLANSANTFFRAID
Location; Situated at Waen farm, Llansantffraid
Owner Permit; Waen Farm
Availability; Day and Season tickets 1 mile of left bank fishing
Fish Species; Brown trout, Barbel, Chub, Barbel
Web site;
www.vyrnwyaccommodation.co.uk/fishing.html
Additional information; Contact Mr Hughes, Llansantffraid for more info. Close season applies.
RIVER VVRNWY - LLANSANTFFRAID
Location; Situated Downstream of Llansantffraid village
Owner Permit; Bryn Vyrnwy
Availability; Day and Season tickets 1 mile of left bank fishing
Fish Species; Brown trout, Barbel, Chub, Barbel
Additional information; Contact Mr D Williams, Bryn Vyrnwy, Llansantffraid for more info. Close season applies.
Star Rating ***