Performance - The look is classic, but today's Caterhams are anything but outdated. Caterham work constantly on the evolution of their cars to ensure that performance never stands still. Indeed, the history of the Seven reads as an annual catalogue of technical development, innovation and functional design, and there is no intention for this to change.

The Racing - And there is nothing outdated about the racing either. No quarter is given as drivers jostle for position. It is a non-contact sport, but wheel-to-wheel racing often means that contact is inevitable, especially in cars that are so uniquely manoeuvrable. And boy do these drivers manoeuvre.

The Ladder - The structure of Caterham Motorsport also allows for rivalries to develop as drivers progress up the unique championship 'ladder'.

It comprises four tiers in which the same model car can be used, but with upgrades as each rung is scaled: from the Academy, through Roadsport, and Tracksport to Supersport championships. There is also a further, high-performance level that uses the R300 racing car: the Superlight Championship.

The Championships -

Academy

Cars - Caterham Seven road-legal racing chassis, with full road-legal trim

Drivers - Exclusive to drivers with no racing experience

Performance - 125bhp Ford Sigma engine

Speed - Typical lap time - 1'26" - Snetterton

History - 1000 drivers in over 20 sell-out years

Format - Five championship scoring 15-20 minute races

Roadsport

Cars - Caterham Seven from Academy with Roadsport upgrade

Drivers - Previous year's Academy drivers; novices at Caterham's discretion

2014 Champion - Jack Sales

Format - 20 minute races over 14 rounds

Tracksport

Cars - selected previous years' Roadsport, Tracksport and Academy Sevens with relevant upgrades

Drivers - Previous year's Tracksport and Roadsport, returning Academy from 2 years before, all other drivers (no restrictions)

Performance - rev limit increased from 6800-7200rpm*

2014 Champion - Stephen Nuttall

Format - 30 minute races over 14 rounds

*increased revs provides a 'modest' increase in performance that takes advantage of running without a windscreen

Supersport

Cars - Previous years' Tracksport, Roadsport and Academy Sevens with relevant upgrades

Drivers - Previous years' Supersport, Tracksport, returning Roadsport from 2 years ago; returning Academy from 3 years ago; all other drivers (no restrictions)

Performance - limited slip differential (LSD) added* giving additional grip out of low-speed corners, greater control in rear of car, increase to 140bhp

2014 Champion - Mike Hart

Format - 30 minute races over 14 rounds

*LSD means torque is transmitted equally to both rear wheels, stopping too much power being delivered to one wheel, so both wheels in powered rotation at all times

Superlight R300

Cars - Caterham Superlight R300 race cars (different model from other champs)

Drivers - drivers registered and competing for previous year's championship, drivers with new cars bought for current season

Performance – 2 litre, 175bhpm, with power-to-weight ratio of 350bhp per ton

2014 Champion - Aaron Head

Format - 30 minute races over 14 rounds

The aim for all levels of the Caterham Championship ladder is high power-to-weight ratio. This means ultimate performance and handling, allowing for the drivers to push the cars to the absolute limit through the corners and when overtaking. The order on the grid, then, is no indicator of finishing position. This is unpredictable racing with a classic look in genuinely quick cars – even with a 70kg rider on board, the Superlight R300 delivers 300bhp per ton, comfortably more than an M3, 911 or Evo FQ-360.

Highlights from Silverstone available now on All 4 On Demand.

Silverstone

Location: Northamptonshire

Length: 3.660 miles/5.891km

Highlights from Donington Park: May 31st on Channel 4, and All 4 On Demand for 30 days after.

Donington

Location: Leicestershire

Length: 2.5m/5.023km