Hornby found out someone had already acquired the rights for the Titfield Thunderbolt, got worried about it and made a very knee-jerk announcement that they were planning to make a Lion hoping to steal a march on whichever company were also planning too (8th March). You can tell how rushed it was by the fact there was no info, no artwork, nothing. That then forced Rapido's hand in making their initial announcement of the Titfield range early (9th March) complete with beautifully done custom artwork showing they had been planning the project for a good while. But they still held back the details until the 1st of April (which was when they were going to fully announce) because in true Rapido sense of humour they knew loads of people would think it's a joke, and even timed it to go live at 12 when April Fools day technically ends. Rapido went into quite a lot of detail about the situation in one of their newsletters around the time.
It's very obvious both companies had been working on their respective ideas for a long time and this does not seem to be one of those examples of one company hearing an announcement and then trying to beat the other out of spite, this is just a case of bad luck. However it seems obvious that Hornby were nowhere near as ready as Rapido were to announce, and I see nothing in Rapido's actions that indicate they are playing into the tit-for-tat game that is so sadly being played out across the hobby these days.
Edit: Link to said newsletter: https://myemail.constantcontact.com/Rapido-UK-News---No--3.html?soid=1101318906379&aid=sGWrBCZGI0M