Costs
Seasons are key
The strength of Sterling will make perhaps the biggest difference to foreign visitors, but even then accommodation in prime locations like Cambridge can be faily expensive. Much depends on where you are and seasonality.
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At the budget end (staying in hostels, rarely eating out, walking and visiting mostly free sights), you might be able to get away with about £40 per day.
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A more average budget for most visitors (staying at standard hotels or B&Bs, eating out once a day, going to the full range of sights and taking public transport), would be around double that, at £80.
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Double that again and £160 buys a pretty high-end experience, with smart hotels, meals at the full range of restaurants and taking taxis around town whenever you feel like it.
Note that traveling solo will probably raise any of these per-person-costs by at least a third for all except budget travellers.
Cash is widely used and many smaller businesses prefer it to electronic transactions. Although bank outlets have been cut back, there are plenty of cash dispensers.