As per Image, they are Roe deer. A Doe and what looks like this years offspring.. The Roe Rut is on here in Somerset, so the Bucks will be around the Does for a week or so soon. Normally Roe deer stay in a fairly local area and can be in groups of around 3-5. Depending on the time of year the group can include male and female..
With regard to your garden, Roe are known as selective browsers, so they go from plant to plant and nibble out the delicate centre parts.. normally in fields this is over a bigger area, so they do fairly low level damage, although they do like standing mature Wheat to eat...
If a Roe Buck is living in your area they can mark their territory by brashing small shrubs and trees with their antlers before and during the Rut, this results in the bark and lower branches being partly stripped. If you come across a 4 to 5 meter ring around ta small shrub or lone small tree, this is known as Roe ring and this occurs during the Rut by the Buck chasing the Doe around and around until she agrees to mate..
