The azalea is in a pot on my patio and now it has flowered. I have no colour that's why I thought I would put some bedding plants around the shrub.
Yes, annual bedding plants will add color to your patio. Since you probably have your azalea in part shade to shade, look for similar requirements for your bedding annuals. Begonias, impatiens, coleus, snapdragons, caladiums, and torenia are good choices.
They are in plant container and have been established for a number of years.
This could be a fertilization issue if you do not fertilize regularly. Also, have they outgrown the container? Are they rootbound? Has the soil ever been replaced or added to? Also check the petals for spots, which can indicate a fungal disease, petal blight.
This article will help: https://www.gardeningknowhow.com/ornamental/shrubs/azalea/common-azalea-problems.htm
What is the name of this plant please? It has an infestation of white caterpillar-like organisms under some of the leaves. What is that and how can I eradicate it please? See 2 photos.
That looks to be an Azalea.
Removal of These will be, mostly, by hand. After removing, you can treat with a pesticide.
Here are some articles that will help:
https://www.gardeningknowhow.com/special/organic/what-are-organic-pesticides.htm
https://www.gardeningknowhow.com/plant-problems/pests/pesticides
One landed on me and bit me!
Sounds like a biting fly! Flying insects are hard to control; sometimes avoidance is the best you can do, such as wearing a product containing DEET while outside.
https://www.gardeningknowhow.com/plant-problems/pests/insects/how-to-stop-no-see-um-insects.htm
https://extension.uga.edu/publications/detail.html?number=C782&title=Stinging%20and%20Biting%20Pests
https://www.gardeningknowhow.com/plant-problems/pests/insects/how-to-stop-no-see-um-insects.htm
Soil is clay and is probably alkaline.
Sounds like your soil needs to be amended before you plant the Gumpo azaleas, which, like the earlier-blooming varieties, prefer moist, well-drained soil with a pH between 5.2 and 6.0.
Adding amendments to your soil to improve drainage and lowering the pH will make your azaleas happy. Azaleas don't normally require fertilizer unless they show signs of nutritional deficiency. However, since your soil pH is alkaline, you can add fertilizer recommended for azaleas and camellias. In addition, I am including links to articles with more information:
https://www.uaex.edu/yard-garden/resource-library/plant-week/gumpo-azalea.aspx
https://www.gardeningknowhow.com/garden-how-to/soil-fertilizers/raise-acid-level-soil.htm
https://www.gardeningknowhow.com/ornamental/shrubs/azalea/fertilizer-for-azaleas.htm
...growing more out than up. Like the outer branches have fallen over and are growing more on the ground while the inner branches are growing up ...
This is the natural shape of the bush. Here are some articles for their care and pruning:
https://www.gardeningknowhow.com/ornamental/shrubs/azalea/pruning-azaleas.htm
the one side and the other side still looks pretty good. Can you help me with the problem?
Unfortunately, your photo did not come through.
Two things come to mind. Fire blight, or sun damage.
Here are some articles that will help:
https://www.gardeningknowhow.com/ornamental/shrubs/azalea/common-azalea-problems.htm
https://www.gardeningknowhow.com/plant-problems/disease/fire-blight-remedies-and-symptoms.htm
https://www.gardeningknowhow.com/ornamental/shrubs/azalea/azalea-branches-dying.htm
https://www.gardeningknowhow.com/garden-how-to/info/what-is-copper-fungicide.htm