Now, are all the Welsh happy about the Poles living in Wales? Would they be happy if foreigners, notably Poles, started buying land in Wales? In Wales, there was an attempt at blowing up a house where a Polish family lived. There have been beatings of Poles working there. There was - maybe still exists - a Welsh hate website levelled at Poles.
The Welsh have a history of doing this with incomers, particularly the English, so again, no special treatment for Poles there. A particular fringe see themselves as an oppressed and exploited people and resent people buying Welsh land and houses and running up the prices. A few years ago a number of English owned premises were firebombed. Mind you, at least Poles can buy land in UK, foreigners had to wait 7 years to buy land in EU Poland, if I remember correctly.
Another reason for some antagonism against Polish dwellings was the practice of local firms renting accomodation for their Polish workers and queue jumping the rnting/buying process. This happened in Telford, Shropshire when a syndicate had promised a number of local families new flats. In some cases two weeks before they were due to move in they were told the flats weren't available. It turned out a local factory had hird all the flats for their incoming workers (funnily enough the local press played it down, so I'm told).
I live and work in Poland and I've had absolutely nothing but hassle concerning bureaucracy... 'foreigners can't start firms in Poland!' (seems the local offices had thir own ideas), "You can't get credit because you don't have an id with your PESEL" (which is a card which doesn't exist), "you can't get 5 year credit to buy a car because you don't have 5 years on your id card and you might run away back to UK".
As for minimum wages and no contracts, fact of life for many Brits (I remember seeing a programme in Poland about how Ireland had no minimum wage). A friend of mine has worked over 20 years in the temp market and now has not been able to get work for over 6 months. I workd as a temp in UK during the summer (2008) and it took me weeks to find a job (they wouldn't accept my UK photo driving licence as id!!!!) and then it was only 6 quid an hour. McD's pay 6.37! I was told the rate hadn't moved in 3 years.
Ironically I was earning more in Poland as an hourly wage.
As to only taking low wage jobs... if you are not going to stay long in a country and forge a career it can be hard to get well paid jobs. I heard several times that employers were moaning that there wer a lack of skilled workers in highly skilled jobs which could have been filled by Polish workers IF they had tried for them.