How to deal with regression?

[vbus]

DS is 4.2yrs and was potty trained at 3.5yrs and rarely has accidents but this past week he has been having 1-2 accidents/day and does not seem bothered about it. He even refuses to get out of his pooey pants (grim!)
I think it's happened as he's gone back to nursery after the hols but not quite settled back in his routine yet.

I'm starting to lose patience with him especially as it can take up to half hr for him to actually agree to take his pants off to let me clean up and change him. He doesn't like changing for some reason and it's starting to become a bit of battle. What can I do to help him get over this?

bump - any ideas, back to using reward chart?

Oh lor, I came on here to see if anyone had any ideas - I certainly can't offer advice.

Can I piggy back the problem please - 3.5 year old, been toilet training since November 2008, was doing not too badly but in last 2/3 months or so just leaking, having accidents, weeing on bathroom floor etc. Also won't tell us when has done poo, just pulls up knickers and carries on with life.

She keeps stopping en route to the loo to pick up entertainment to take with her, and in the delay wets herself. Having books etc in the bathroom doesn't help.

She is totally not bothered about the fact that this is happening. Dad blowing his stack about it a lot of the time which probably doesn't help, but I'm being a bitch too as we're both fed up. She is mostly dry at night so bladder control potential clearly there.

Would it be counterproductive to put her back in nappies? I don't want to be cruel, god forbid, but she doesn't seem to get it and she doesn't care. Possibility of UTI has been eliminated already.

Sorry vbus, hope you don't mind me adding my problem rather than helping with yours. But clearly you aren't alone.