Shaftesbury chief executive Jonathan Lane has invested a further £100,000 in the property investor. Lane has bought 22,222 shares at 450p each. That takes his stake to 966,233 shares, which is worth £4.3m at the latest purchase price. Lane raised just over £99,000 from the sale of option shares last December. The property company is focused on London's theatre-land district and in February it said demand for its properties has remained healthy since the end of September. The company said investment activity in London's West End is returning to more normal levels, with Shaftesbury playing its part, having bought properties at a total cost of £30m since October. The group expects a further increase in activity over the next 12 months. Shaftesbury has tapped £486m of its £575m committed bank facilities. The average all-in cost of its bank debt at 31 January 2011 was 4.62%. Including its £61m of debenture borrowings, the overall cost of debt was 5%.Top Director Buys Shaftesbury (SHB) Director name: Mr Jonathan S LaneAmount purchased: 22,222 @ 450.00p Value: £99,999Diploma (DPLM) Director name: Mr I HendersonAmount purchased: 25,000 @ 276.00p Value: £69,000Development Securities (DSC) Director name: Mr Sarah BatesAmount purchased: 30,000 @ 203.00p Value: £60,900SThree (STHR) Director name: Mr Clayton BrendishAmount purchased: 12,000 @ 421.90p Value: £50,628CPP Group (CPP) Director name: Mr Duncan J McIntyreAmount purchased: 13,340 @ 297.00p Value: £39,620Xchanging (XCH) Director name: Mr Nigel RichAmount purchased: 50,000 @ 63.73p Value: £31,865International Ferro Metals Group (IFL) Director name: Mr Terence Vincent Coleman WillsteedAmount purchased: 100,000 @ 23.75p Value: £23,750Innovation Group (TIG) Director name: Mr Jane HallAmount purchased: 124,924 @ 15.85p Value: £19,800e-Therapeutics (ETX) Director name: Mr Steve SelfAmount purchased: 50,000 @ 36.50p Value: £18,250Mediwatch (MDW) Director name: Mr Philip G StimpsonAmount purchased: 550,000 @ 2.60p Value: £14,300Top Director Sells Serco Group (SRP) Director name: Mr Christopher R HymanAmount sold: 78,275 @ 582.76p Value: £456,155