Torches - needs to last at least an hour. Rechargeable is best but be aware that the large very bright torches that are frequently sold in DIY stores are too bright as the light bounces back and does not allow you to develop night vision and some only run for 15 mins after a charge. They probably give the toads a headache as well!
A broad even beam is best as you are looking for toads at about 5m distance - not 500m!
Holding your torch at eye level enables you to see the light bouncing back from the toads' eyes and to spot them more easily at a distance.
Head torches are good because they leave your hands free but not easy to wear with a hat or hood and it is often raining when the toads are moving. Also it is very easy to blind car drivers and other toaders by accident! The light can bounce back at you from road signs and puddles.
The torches below have been found to be suitable -
Lloytron D1001BK is a lightweight LED torch that one patroller bought in 2012 at Thorns and she is happy with it and reports 3hrs running per charge. Google it to find online at various places - on Amazon for £12.50 inc delivery as at 9th March 2013
Clulite Classic - traditional incandescent bulb and lead acid battery (can be replaced after about 5 years when it loses capacity). Comes with a spare bulb and all spares can be purchased from Clulite. Many websites sell it for about £23. About 3 hours per charge.
Clulite Rechargeable LED Headtorch - this torch is a bit too focused to be ideal for toading but you can spot toads at a distance and it can go for 24 hours on a single charge. Good value for a LED headtorch with a Li-ion battery. Can be found on Amazon.
Sealey - PLEASE NOTE - In Jan 2013 it was noted that this link now points to a very differnt LED torch which has a poor switch and is probably not very water resistant. Old model was about £23 and ran for 4 hours per charge, quite heavy.
Maplin have spare 6V Krypton bulbs for the old incandescant Sealey torch - part no KU04E
MDS have replacement bateries - Part number NP4-6