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Now my wigelia ( spelling ? ) has finished flowering I want to cut it back do I do it now or wait a while.
Also I want to cut back my orange blossom this year when do I do that apart from after its stopped flowering ?

I'd cut back both once they finish flowering.

Weigela (pronounced Vie - gella after the German scientist Wiegel, but most people say Why - Jelia).
As soon as your Weigela has finished flowering, prune out all of the flowered stems by about one third of their length. This will produce plenty of flower buds for next year. Same for your Mock Orange (philadelphus)

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It has been said that the best pruners are flower arrangers, e.g. they cut out the flowering stems. Best advice for both these shrubs is to cut back after the flowers have finished.