I plan on going to the UK to visit my boyfriend in March and have recently got a trespasssing misdemeanor here in California, USA. Will I have a problem when entering the UK at Heathrow London airport??? I have a normal passport and need to know is there anyway the UK can find out.
I seriously don't think you need to sweat it. The only problem I am aware of is US citizens with a DUI on their record being turned away at the Canadian border. DUI is a felony in Canada, and they have access to US driving records.
I suppose you could inquire at the British consulate if you want to be absolutely sure.
There have been a number of changes to UK Immigration Rules that came into force on 13 Dec 2012. One set of these has tightened up significantly the area of mandatory refusal on the grounds of past criminality,. This recent change may make past experience and advice not something necessarily to rely upon. One point here though is that trespass in general in the law of England and Wales is not a criminal offence - it is a civil matter. The advice of the Border Agency is: "We strongly advise that you apply for a visa before travelling to the UK if you have any unspent criminal convictions in any country, including the UK".