Torchy Videos are very difficult to acquire. The programmes were aired on the Bravo satellite channel in the UK before that channel migrated from being an excellent nostalgia channel into being a seedy soft-pornographic channel.

http://www.blackstar.co.uk/circle/search?words=torchy
http://www.blackstar.co.uk/video/item/7000000020522
http://www.blackstar.co.uk/video/item/7000000021952
http://www.users.bigpond.com/BASE_KOALA/GA.Memorabilia/Torchy%20The%20Battery%20Boy_Checklist.htm

A pirate video set for Torchy, Twizzle and others appears at ebay from time to time.

That’s where I got mine from.
Try the following email address: jfielding@mcmail.com
Also try: this ebay link
3 Hour UK PAL video compilation of rarely seen productions from Gerry Anderson. The video comes in a plain cardboard sleeve. The contents are as follows: THE ADVENTURES OF TWIZZLE "TWIZZLE MEETS FOOTSO" / TORCHY THE BATTERY BOY "POMPOM & THE TOYS", "TOPSY TURVY LAND", "TORCHY & SQUISH", "THE BUILDING OF FRUT TOWN" / FOUR FEATHER FALLS "KIDNAPPED", "LITTLE BIT O'LUCK", "FIRST TRAIN THROUGH", "RIDE'EM COWBOY" / THE INVESTIGATOR (NBC PILOT FILM) / WALLS ICE CREAM AD - SUPERCAR CORNET / LYONS MAID ICE CREAM ADS - FIREBALL XL5 ZOOM "LAUNCH" & "LOOK OUT" STINGRAY/TBIRDS - ZOOM / SUPER SEA JET / FAB, THUNDERBIRDS ZOOM "TRACY ISLAND", "UNDER ATTACK", "BRIDGE", "MONTE CARLO" CAPTAIN SCARLET ORBIT "POST OFFICE TOWER" & "NEW CLIMBER", JOE 90 ZOOM "LONDON" / KELLOGGS SUGAR SMACKS - THUNDERBIRDS (GENERIC VERSION), CAPTAIN SCARLET BADGES OFFER & GENERIC VERSION, JOE 90 GENERIC VERSION & VARIETY PACK / BLUE CARS MARTIANS / JIF DESERT TOPPINGS ALIEN ATTACK / LYONS MAID ICE CREAM SPACE 1999 / LINCOLN TOYS STINGRAY / IMAI MODEL TOY ADS THUNDERBIRDS X 6 / THUNDERBIRD ONE PROMOTIONAL FILM / STINGRAY FRENCH OPENING TITLES (ALT THEME) JAPANESE OPENING TITLES (ALT THEME) / THUNDERBIRDS "LES SENTINELLES DE L'AIR!" OPENING TITLES & JAPANESE OPENING TITLES (ALT THEME) / CAPTAIN SCARLET - FRENCH OPENING TITLES x 2 FRENCH CLOSING TITLES (ALT THEME) & JAPANESE OPENING TITLES & MYSTERON THREAT / JOE 90 JAPANESE OPENING TITLES / SPACE 1999 "COSMOS 1999" OPENING TITLES & JAPANESE OPENING TITLES / THUNDERBIRDS ARE GO THEATRICAL TRAILER (WIDESCREEN) / THUNDERBIRD SIX THEATRICAL TRAILER (WIDESCREEN) / NOT ONLY BUT ALSO - COMPLETE "SUPERTHUNDERSTINGCAR" SKETCH.
From time to time pirate videos are sold on ebay from the USA, but these are to the NTSC standard and will need to be dubbed to PAL in the UK. Quality is very poor.