What were the pros of the Romans invading Britain?

The Romans revolutionised and improved British agriculture. They introduced better farming methods. They introduced vegetables (asparagus, cabbages, carrots, celery, garlic, leeks, onions, peas, radishes, turnips, shallots) herbs (bay, basil, rosemary, thyme and savoury mint and herbs that were used in brewing and for medicinal purposes). They also introduced new and more productive grains which made bread became important in the British diet. They brought white cattle, brown hare, chickens, guinea fowl, pheasants, and rabbits were probably introduced as farmyard animals. The fruit they introduced included Apples (as opposed to crab Apples), grapes, cherries, mulberries and Pears. They also brought walnuts and sweet chestnuts.

The Romans also introduced new and more efficient manufacturing processes and mining technology and increased trade with the rest of the Roman Empire. Britannia exported metals (, lead, iron, copper, gold,and sliver), salt, oysters and some types of pottery. British woollen products were considered the best in the Empire. It imported coins, pottery, quern-stones, silverwork, brass products, glassware, olives and olive oil, and salted fish.

The Romans built roads and services needed by travellers, new towns, baths, theatres and amphitheatres and fortifications. The British elites became romanised.