wow and flutter

Make sure the belt is new or in good condition. Clean the rim of the subplatter and the pulley with isopropyl alcohol. Then clean the belt in hot soapy water so that it feels sticky to the touch afterwards.

If it's a planar 3 with the old motor then make sure the motor mount belts are in good condition.

Last, use some double sided tape (carpet tape works well) to secure the felt mat to the glass platter to prevent slipping.

Speed stability is not the rega's strongest suit, but I've found the above steps help significantly.

There is lots about the Rega Planar and speed stabilty on this forum.Do a search of the archives and you find various approaches to the problem.

Get a rim drive or quartz locked (linear) direct drive turntable. A lesser belt drive will always give you troubles. Don't feel bad, there's multi thousand dollar belt drive decks that will also fail that test!

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The test is meaningless as it is merely an objective measurement that does not correlate to music. Music in its essence is ever changing and the ear actually prefers changes in pitch that are interpreted by the brain as more musical in that they keep the brain's musical centres interested and make the experience more musical and not less. This may be counter intuitive, but audiophiles know that objective measurements are more than useless when it comes to appreciating the musicality of a system and the emotional response it can create.