Sory link only to catalogue, here is relivant section from near the end of
catalogue 1.

SOIL WARMING CABLES - make your own Propagator or Hot Bench
RRP Our Price
3M 50w Soil Warming Cable 21.25 15.99
6M 75w Soil Warming Cable 28.50 21.50
12M 150w Soil Warming Cable 38.05 29.99
24M 300w Soil Warming Cable 53.50 41.99
48M 600w Soil Warming Cable 97.99 92.99
Thermostat for Soil Warming Cable 32.99 24.50


--
David Hill
Abacus nurseries
www.abacus-nurseries.co.uk