1. Dandelions: Bright yellow flowers that are a common sight in lawns and gardens. They have deep taproots that can make them difficult to remove, and they can quickly spread if not controlled.
2. Plantain: This weed has broad, oval-shaped leaves and a rosette of small flowers. It is common in lawns and gardens and can be a problem in heavily trafficked areas.
3. Clover: This weed has three-leaved foliage and small white or pink flowers. It is often found in lawns and can be a problem in areas with poor soil.
4. Daisy: This weed has a yellow central disk and white petals. It can quickly spread and can be difficult to remove once established.
5. Common Groundsel: This weed has small yellow flowers and can grow in dense clusters. It is often found in lawns and gardens and can be a problem in areas with poor soil.

Less Common

1. Common Buttercup: This weed has shiny, yellow flowers and glossy green leaves. It can quickly spread and can be difficult to remove once established.
2. White Clover: This weed has small, white flowers and is often found in lawns and gardens. It can be a problem in areas with poor soil.
3. Annual Meadowgrass: This weed has thin, narrow leaves and small, inconspicuous flowers. It is often found in lawns and can be a problem in areas with poor soil.
4. Creeping Buttercup: This weed has shiny, yellow flowers and glossy green leaves. It can quickly spread and can be difficult to remove once established.
5. Ribwort Plantain: This weed has long, narrow leaves and small, inconspicuous flowers. It is often found in lawns and can be a problem in areas with poor soil.

Least Common

1. Selfheal: This weed has small, blue or purple flowers and can grow in dense clusters. It is often found in lawns and gardens and can be a problem in areas with poor soil.
2. Common Sorrel: This weed has small, red or brown flowers and can grow in dense clusters. It is often found in lawns and gardens and can be a problem in areas with poor soil.
3. Redshank: This weed has small, pink or red flowers and can grow in dense clusters. It is often found in lawns and gardens and can be a problem in areas with poor soil.
4. Common Couch: This weed has thin, narrow leaves and small, inconspicuous flowers. It is often found in lawns and can be a problem in areas with poor soil.

Please note that these weeds are the most common in UK lawns, but there are many other types of weeds that can also be found in different regions or specific conditions. It’s important to consult with a professional lawn care expert for accurate identification and treatment of any weeds in your lawn.