See the instructables post by Andrea Biffi
1µF 450V 85°C Radial Electrolytic Capacitor
http://www.maplin.co.uk/p/1f-450v-85c-radial-electrolytic-capacitor-vh17t
470µF 25V 105°C Radial Electrolytic Capacitor
http://www.maplin.co.uk/p/470f-25v-105c-radial-electrolytic-capacitor-dt66w
Metallised Ceramic Plate 2200pF Capacitor
http://www.maplin.co.uk/p/metallised-ceramic-plate-2200pf-capacitor-wx72p
Metallised Ceramic Plate 47pF Capacitor
http://www.maplin.co.uk/p/metallised-ceramic-plate-47pf-capacitor-wx52g
1N4937 1A Fast Recovery Rectifier
http://www.maplin.co.uk/p/1n4937-1a-fast-recovery-rectifier-n83ca
1N4148 150mA Switching Diode
http://www.maplin.co.uk/p/1n4148-150ma-switching-diode-ql80b
NE555N Timer
http://www.maplin.co.uk/p/ne555n-timer-qh66w
13R104C INDUCTOR, 100UH, 10% 1A TH RADIAL
http://uk.farnell.com/jsp/search/productdetail.jsp?CMP=i-ddd7-00001003&sku=2062696
IRF740PBF TRANSISTOR, MOSFET, POLARITY N
http://uk.farnell.com/jsp/search/productdetail.jsp?CMP=i-ddd7-00001003&sku=1653662
BC547BTA TRANSISTOR, NPN, 45V, 300 MHz, 100 mA, TO-92
http://uk.farnell.com/jsp/search/productdetail.jsp?CMP=i-ddd7-00001003&sku=2101372
BC557B TRANSISTOR, PNP, 45V, 150MHz, 100 mA
http://uk.farnell.com/multicomp/bc557b/transistor-pnp-45v-100ma-to-92/dp/1574384
Metal Film 0.6W 33k Ohm Resistor
http://www.maplin.co.uk/p/metal-film-06w-33k-ohm-resistor-m33k
Metal Film 0.6W 1k Ohm Resistor
http://www.maplin.co.uk/p/metal-film-06w-1k-ohm-resistor-m1k
Metal Film 0.6W 10k Ohm Resistor
http://www.maplin.co.uk/p/metal-film-06w-10k-ohm-resistor-m10k
Metal Film 0.6W 220k Ohm Resistor
http://www.maplin.co.uk/p/metal-film-06w-220k-ohm-resistor-m220k
Metal Film 0.6W 470 Ohm Resistor
http://www.maplin.co.uk/p/metal-film-06w-470-ohm-resistor-m470r
Omeg 1k ohm Linear Single Gang Potentiometer
http://www.maplin.co.uk/p/omeg-1k-andohm-linear-single-gang-potentiometer-fw00a
Metal Film 0.6W 15k Ohm Resistor
http://www.maplin.co.uk/p/metal-film-06w-15k-ohm-resistor-m15k