uk tax year end

Given the unusual pattern of share movements in the past few days, I wonder how much of the swing is due to UK investors consolidating their Capital Gains Tax losses (i.e., selling) before the end of last fiscal year on April 5th, and then buying back back on/after April 6th? If I'm right (an unusual situation :-) ), there must be a lot more of my countrymen (ok, and/or women) holding BQT than just little old me. If so, I wonder why. Let's hope they know something we don't.

Cheers.

Sid