Whilst not in the UK, if you are after a Nemesis-beater in the form of a B&M inverted coaster, built into a made-to measure hole, then look no further than Black Mamba at Phantasia Land. The ride does not let up from start to finish & the dispatch sequence in the underground station with the loud music (that continues up the list hill buildings) is something else. Also look closely at the theming on Black Mamba - the attention to detail is something else. There are even voodoo dolls on the track footers that are visible from the pathways. Phantasia Land is a one-off park in a country with lots of parks (and most owned by different companies) so the competition is real. As has been stated above, the problem we have in the UK is Merlins monopoly of the market - there is no incentive for them to go the extra mile.