A Welsh farmer has developed a brace of security devices to protect gates and trailers from light-fingered visitors.

Charles Lamb’s Trailock anti-theft system was originally designed to slot through the 50mm ring hitch of a trailer to prevent it being hooked up and carted off, but the range now includes five different locks to fit everything from diddy single-axle water bowsers to lorry-towed rigs and army-type Sankey trailers.

Manufactured in Bridgend, the nifty pin system is made from high-quality stainless steel and can be stored in the towing vehicle when not in use.

As a guide, the 30-40mm sliding pin lock costs £75, while the bigger 50mm version is £85.

Another firm, Agrilox, offers similar trailer pin kits, which it sells for £80. There’s also the option of including the padlock in the package, which takes the asking price to £110.

See also: Ultimate guide to farm security kit

Mr Lamb’s other invention is the Gatelock – a simple device that bites on to a gatepost hinge to prevent the gate from being lifted off and stolen.

The long-life, zinc-coated item fits over a 19mm or 3/4in hinge and should be particularly handy for unguarded fields with roadside entries, as well as lane and yard gates.

Only one Gatelock unit is required per gate and it can be fitted quickly with a lump hammer – a few wallops should have it secured.

A single unit costs £14.90, with discounts for bulk orders up to the £64.90 six-pack.