Many Poles do settle in Britain though, move their whole families over, why do you think that is?
Despite Shelley's ludicrous comments about no professional or intelligent Pole wanting to stay in UK, many do. Part of it is simply that work was/is available in UK and the career opportunities are/were better.
Example, several friends of mine have university education and no job opportunities in our region. They moved to Ireland and worked to get money so they could buy flats etc when they returned to Poland. Others found that they could get better paid factory work in UK than their specified profession paid in Poland. Making a career a career jump and discovering the opportunities, many have decided to stay in UK (at least for a longer period)... hence bringing their families over.
An example; a friend of mine is a teacher but teaching pays crap money in Poland so he moved to UK to work, found the opportunities of reasonably well-paid factory work and decided to stay to earn money for a flat. His university educated wife was unable to find full-time work and also has a baby. Hence, it made sense for her to move to UK to be with her husband. Creche facilities allow her to work.
Still others just found that th business opportunities were much kinder in UK than in Poland. example; until recently it took over a month to register and legalise a firm in Poland, before which you couldn't trade. In Scotland a 15 minute phone call could start the process and allow you to start trading. The red-tape in Poland has scared so many UK firms away in the past. I've spoken to several people who say they won't return to Poland.
As for your question about similarities in migration, there are different kinds of migration. In this case we are looking at a predominantly economic migration which will decline and reverse (as it already is). This is different from the wartime/post-war migration where Poles were largely refugees and ex-servicemen who had little opportunity to remain safely in the communist controlled regime.
Things to think about; church, food, language, social clubs, music (try looking up the work of Martin Stokes) and work (many immigrants might find work in the same areas, like post-war West Indians being employed in public transport, Irish in construction etc). Also, contact with "Old Country".
An interesting comparison might be with the 16th/17th Century Scots migration to Poland (look up website Electric Scotland and find books on Scots in Poland and Germany). You'll find many of the same patterns being rpeated: mass migration, niches in the markets, rising stars of the scene, organisation of communities and even some of the complaints sound the same "Scots are as bad as Jews!", "Send 'em Back!", "Scavengers, tax dodgers!". Then the eventual return of many home (and what they did when they got there) or intergration.