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Keep in mind the kind of pressure you have from your current taps. If your pressure isn’t great (usually because you have a large tank in your loft), in most cases you should be picking a style of tap that can cater for 0.5 bar or less. If you have a high pressure system (because you have a combi or unvented cylinder), a tap catering for 0.5 bar or higher would normally be fine.
Please note: Tap pressures are written on the box.
You might not be happy with the amount of pressure you are currently getting from it, so installing a pump would be a brilliant improvement. If you have an unvented cylinder or a combi boiler your pressure should be good enough, so a shower valve designed for high pressure should be sufficient.