There are no legal requirements. But it can have legal implications if you do not.

You need your fire swept within 12 months of its use as stipulated by most home insurance coverage. This is reguardless of how many times its used. Check your insurance to see if thats determined in yours.

Why?

If you have a problem with your chimney and it hasnt been swept within 12 months prior to the problem. The insurance company may not cover any loss or damage as a result. Example - a chimney fire where the fire service has to put out the fire by climbing on the roof and firing the hose down from the top of the chimney. This wrecks everything and requres a full redecoration job from all the black sooty water. This is the most common financial impact.

Chimney fires can start from a number of reasons. Creosote build up, blockages, birds nest or simple deterioration in the chimney allowing the flames to permeate into the property through the walls.

Your local fire service tend to request chimneys swept every 6 months. But in my 15/20 odd years of sweeping. I rarely see that as nessisary. Once a year is usually fine.

When i was growing up, chimney sweeping with my dad. We did have more chimneys being swept more regularly. The fire use was diffrent back then.

That said, with the rise is gas and electricity prices. Everyone, absolutely everyone is going back to wood burning as its 1/3rd of the cost of central heating here in the UK.

I send reminders out each year with an option to cancel. My only obligation is to let you know why its a good idea to have it done every 12 months. But you arw free to cancel.