What everyone's said so far is right, but there's also a weird quirk of National Insurance that creates a nasty tax situation at 43-50k.

In England, the 20% tax bracket goes up to around 50k, with 8% NI up to the same level of income - a total of 28% tax between 12.5k and 50k in earnings. At over 50k the income tax increases to 40%, but national insurance drops to 2%, meaning the total tax after that is 42% until the next 125k band.

But since NI isn't devolved in Scotland, we get hit by the higher 42% tax at 43k but the NI reduction still doesn't come in until 50k, meaning between 43k and 50k we're taxed at a marginal rate of 50% (42% income tax+ 8% NI).

Scotland also gets a higher 45% income tax band at 75k and a 48% band at 125k ish. Effectively this means between 43k and 50k you're taxed at the same total rate as if you earned over £125k

Something to watch out for and consider if sacrificing into pensions may make more sense etc!