UK Bank Holiday date wrong

[athegn]

n my Galaxy S2, 4.0.3, GT-I900P I use Pimlical Calendar app. I have checked "UK Holidays" Most dates are correct but "Spring Bank Holiday" is shown as Thursday May 30th not Monday May 27th.

I have also looked at the stock calendar and that shows the same error. All other holidays are correct.

When I look at my Google Calendar on my PC, to which the phone is synced the correct date for this holiday is shown.

I have tried unchecking and re-checking the "UK Holiday" app but this does not correct the error.

When I look at my wife's Tab 2, which also syncs to my PC Calendar the correct date is shown.

I assume that the "UK Holidays" app on my S2 is somehow corrupted.

Any advice on how to correct this error?

 

[athegn]

When I open the stock calendar I notice there are three "UK Holidays" files; two of which purport to be from the same Google account.

Where did those come from? I have checked each in turn but none correct this error!