Choosing a route that suits small legs

A four-year-old walking at a comfortable pace on uneven ground covers roughly a mile in an hour, and that is before you stop to look at a beetle, throw a stick in a stream or negotiate a gate. Planning a route of two to three miles for a half-day out is plenty. A useful rule of thumb is one mile per year of age, reduced by a third if the ground is rough, boggy or steep — and heathland is often all three.

The best family rambles are not the shortest ones, they are the most interesting ones. Look for a route with features at regular intervals: a wooden boardwalk over a boggy hollow, a footbridge wide enough to play Poohsticks from, a trig point to touch, a sandy hollow where heather gives way to bare earth, a pond with dragonflies. Children who have something to reach in ten minutes do not notice their legs.

Circular routes beat out-and-back walks for most families. A loop feels like an adventure; a return along the same path invites the question "are we nearly there yet?" just as you turn for home.

Set the boundaries before you set off

The single most useful rule for young walkers is simple and easy to remember: stay where you can see me, and where I can see you. Agree it at the car park, before boots are on and excitement takes over, and repeat it at every stile.

Beyond that, a few practical habits make a real difference:

• Name a visible landmark ahead — "see the big oak on the skyline? We all meet there" — and walk towards it together rather than straggling.
• Use a buddy system with more than two children, so nobody is ever walking alone at the back.
• Dress everyone in something bright. A red or orange hat is visible through gorse in a way that a navy waterproof never is.
• Put a card in each child's pocket with your mobile number and the name of the car park. Reception on heathland is patchy, so a piece of paper beats a dead battery.
• Teach older children to stop and stay put the moment they realise they cannot see you. A child who keeps walking to "find" you is far harder to locate.

If someone does go missing, call 999 immediately rather than searching alone for half an hour. Ask for the police and say clearly that a child is missing — on open heathland they may also task a search team. The sooner it starts, the smaller the area.

Pack for four seasons in one afternoon

British heathland is exposed. The same path that is baking at two o'clock can be cold and windswept by four, and lowland heath is often the highest, most open ground for miles around. Layers work better than one thick coat, because children overheat when they run and chill the moment they stop.

• A thin base layer, a fleece, and a waterproof shell with a hood — even in July.
• Spare socks and a spare pair of gloves in winter. Wet feet end walks.
• Boots with proper tread. Trainers are fine on dry sandy paths but hopeless on wet boardwalk, clay or boggy crossings.
• Sun cream and a hat; there is little shade on open heath.
• Water for everyone, and more snacks than you think you need. Flapjack, oatcakes, fruit and a flask of something warm are ideal. Feed children before they ask — hunger and tiredness arrive together.
• A small torch or headtorch, even on a summer afternoon, in case a wrong turn adds an hour.

Staying safe around heathland wildlife

Lowland heath is wonderful, and parts of it bite. Adders bask on sunny patches of bare ground and along heather edges, particularly in the morning. Teach children to keep their hands out of dense vegetation, never to reach under logs or into tussocks, and to stand still and call an adult if they see a snake. Wearing boots and long trousers on rough ground avoids most problems.

Check for ticks when you get home — behind the knees, around waistbands, in armpits and along the hairline. Bracken and heather are prime tick habitat from spring to autumn.

Cattle and ponies graze many UK commons and heaths as part of conservation management. They are used to people but should never be approached, fed or crowded, and dogs should be kept under close control around them.

Walk lightly and protect what you came to see

Heathland is one of the rarest habitats in the world, and Britain holds a significant share of the global total. It is also fragile. Ground-nesting birds such as nightjar, woodlark and Dartford warbler nest on bare, sandy ground between March and July, and a single straying pair of feet can destroy a clutch.

So keep to the paths, even when a shortcut looks tempting, and explain why to the children in terms they will enjoy — "we are walking around their nursery". Leave heather, lichen and flowers where they are; build dens with fallen wood only, and dismantle them before you leave. Take everything home, including apple cores and banana skins, which take years to break down on acid heathland soil.

Finally, tell someone where you are going and when you expect to be back, and check daylight hours before you set out. A family walk that ends in warm, tired, slightly muddy children asking when they can come again is the whole point — and the boundaries, layers and snacks are what get you there.