Merlin parks each need a multi-million cash injection to bring everything up to a high brand standard - it is a simple as that
This is true in general, but the Tomb Blaster thing is especially poor.
The lighting & audio was in a very poor state when it shut in 2015, but the back-end tech didn't need entirely replacing. When the 2016 tech 'upgrade' happened, it was a big waste of their money on making something worse.
New lighting throughout with glowing purple light in the wrong places. New amps & soundcards with whole chunks of audio & spot sounds missing (the most obvious part is the mummies at the end), very poorly programmed music which fades out halfway through or jitters around, poorly remixed and hurts your ears as the trains pass the speakers.
It wouldnt take a multi-million cash injection to fix all this and would have cost less than the big waste of capex they've got now. It's not very difficult to fix either, but it would take somebody who cares, has high standards and is better informed about the ride. I'm amazed Tomb Blaster has got even worse since the 2016 job rather than fixing those errors.
The Hocus Pocus preshow bodge job would have also been very easy to do better on a £0 budget, if higher standards were held internally. To be honest, the park should close the attraction if they don't have the budget to run it as intended with the glasses anymore (though theyre not that expensive). It's outlived its best anyway and is very worn out now, same with Vampire, very lame compared to how they used to be
But didn't they do that 5 or so years ago where they invested £14mill on regenerating the park?
This was a PR claim. The money was almost entirely on the new hotel and existing attractions received no notable reinvestment.