£30 for a 555 timer IC and a couple of resistors/capacitors?
Bloody hell, I should have pursued the electronics rather than settling on being a sparks.
But it keeps my company in business 
I must admit, I do like the "scare" tactic of "Others are selling a standard 5 pin relay & a single resistor"
It's complete & utter bullshit, but then anybody who pays £30 for a 20p IC will believe it anyway.
End of day, 30 quid is nothing if it solves to hot start problem really is it?
20p is ‘complete & utter bullshit’ anyway!
20p for a 555, yeah maybe, but then you need to pay P+P

Caps will again be 10p each (wonder what the minimum order is? 25?)
Resistors will be a few pence each (can you buy them in quantities under 50?)
Would need a relay too, so that’s going to be 75p.
Then a little project box £1.25...
Not to mention the time to actually put all this together, and determine all the component values in the first place.
What starts off as a cheap 20p job will soon be at least 5 quid. (On a one off basis remember) Not to mention the few hours of time involved in sourcing, building, testing, packaging it!
The other problem is most people don’t have 555 timers, caps + resistors, veroboards, soldering irons laying about, and more so most people wouldn't have a clue where to do with them if they did!