Sorry Silvabod I gave you some incorrect information. As this distribution is a Capitalisation Issue and not a dividend it is not subject to income tax. Please see the following Q & A from HBOS
http://www.hbosplc.com/shareholders/Capitalisa tionIssueQ&As.asp
Regarding a share's value on a given day penalising a holder with a double whammy, by the same token share prices can also rise, giving a gain which will only be crystallized when sold but subject to Capital Gains Tax if applicable.
Much will depend on the terms of the Lloyds TSB offer and subsequent market events