I don’t feel a prospective buyer would worry about one cracked/broken tile to be honest. Nowadays people usually update a new home to their own taste. I would remove the tape unless it is a trip hazard as that will only make it look worse.

We're doing a total ground floor renovation on a late Victorian townhouse in London and I'm attracted to the idea of using tile in the entry hallway - maybe something light and/or colourful to lighten up the space, which will be dark. I also want to tile the walkway up to the house at some point in the future (when we have recovered financially from the renovation!) Thinking ahead, should the tiles match? I like traditional Victorian encaustic tiles for the outside (e.g the Lambeth pattern in beiges and blues), but I was thinking of something more modern/maybe in gray and white for the hallway. Should they match?

Walls and Floors have these https://www.wallsandfloors.co.uk/white-tiles-white-floor-tiles-15072 https://www.wallsandfloors.co.uk/matt-black-white-floor-tiles-black-floor-tiles-15071

It’s common for tiles to be slightly bowed. For this reason this brickbond layout of tiles is very unforgiving for these large tiles because you have lined up the edges that are bowed in with the middle that is most bowed out. Had they been small tiles you wouldn’t have noticed but the effect is exaggerated with large tiles. That’s why the manufacturer recommended an offset brickbond laying pattern. 90/10 would have looked great. Given your efforts to convey this instruction to the tiler it’s disappointing that a professional who should know it’s not recommended to lay large tiles 50/50 brick bond to avoid exactly this situation went and did it anyway. I think the tiler is liable because even absent your instruction he should have known better. It’s professionally embarrassing that he has done it. I think the contractor also shared some responsibility if they hired the tiler. Basically it’s their recommendation, their reputation that is being damaged by poor workmanship and their relationship with you that is at risk. Consider the paper trail - did you get a quote directly from the tiler or through your contractor? It may be that you get nowhere but you should try to get the tiler to accept responsibility. After an firm conversation you need to write to him to outline what you feel is his fault and clearly stating what you expect him to do in return (such as replace all the tiles). You also need to state a timescale for response from him. If you can get it changed on his dime then happy days. If you have to pay for it you might conclude that you can’t live with it. Personally I wouldn’t spend the money a second time myself and I would live with it.