Here the best shrubs for pollinators in the UK during the month of October:

1. Viburnum opulus (Guelder Rose): Viburnum opulus produces clusters of small, white flowers in early autumn that are very attractive to bees and butterflies. The flowers are followed by bright red berries that persist into winter and are a great source of food for birds.
2. Berberis (Barberry): Berberis produces clusters of small, yellow flowers in early autumn that are very attractive to bees and butterflies. The flowers are followed by small, bright red berries that persist into winter and are a great source of food for birds.
3. Euonymus europaeus (Spindle Tree): Euonymus europaeus produces small, greenish-yellow flowers in early autumn that are very attractive to bees and butterflies. The flowers are followed by bright pink or orange-red berries that persist into winter and are a great source of food for birds.
4. Symphoricarpos (Snowberry): Symphoricarpos produces small, pink or white flowers in early autumn that are very attractive to bees and butterflies. The flowers are followed by white or pink berries that persist into winter and are a great source of food for birds.
5. Sarcococca confusa (Sweet Box): Sarcococca confusa produces small, white flowers in early autumn that are very attractive to bees and butterflies. The flowers are followed by small, black berries that persist into winter and are a great source of food for birds.
6. Cotoneaster: Cotoneaster produces clusters of small, pink or white flowers in early autumn that are very attractive to bees and butterflies. The flowers are followed by small, red or black berries that persist into winter and are a great source of food for birds.
7. Escallonia: Escallonia produces clusters of small, pink or white flowers in early autumn that are very attractive to bees and butterflies. The flowers are followed by small, edible fruits that persist into winter and are a great source of food for birds.
8. Hypericum (St. John’s Wort): Hypericum produces clusters of small, yellow flowers in early autumn that are very attractive to bees and butterflies. The flowers are followed by small, black or red berries that persist into winter and are a great source of food for birds.

By planting these and other shrubs that produce flowers and berries in the autumn, you can help support local populations of bees, butterflies, and other important pollinators throughout the season.