Roman occupation and the impact on Britain
I can recommend getting hold of a book by P H Sawyer called "From Roman Britain to Norman England" (published about 1980) which has a brief but good analysis of the impact of Rome on the British Isles.
In the last 25 years or so there has been a lot of research suggesting that the British tribes in the South and East had a lot of trade contact with the empire before the conquest in AD55. Along with the trade there would almost certainly have been a lot of technological and cultural exchange.
It is almost certain that Emperor Claudius had arranged alliances with some of the tribal chiefs before the invasion of AD55. The concept of Roman sponsored client chiefs who exchanged co-operation for political backing from Rome was established right from the word go.
It is certain that the Romans had a profound influence on technology in Britain but it is not clear whether the occupation was a necessary pre-condition for the spread of this technology. In my opinion the Romans had a more fundamental impact on Britian in terms of the political syste of client states that became the norm after the occupation.
Good luck with the research!
Best wishes
Aquinas.