We took profits on Dunfermline's Optos retinal imaging group on Wednesday morning after shareholders nodded through their acceptance of a lucrative takeover offer from the Japanese Nikon group.

The sale realised a notional £358 gain for our 2015 portfolio and freed up sufficient cash to make two fresh share purchases following an earlier disposal of a loss-making investment in the Home Retail Group.

We plumped for very different Scottish companies listed on the AIM market in the form of Edinburgh's healthcare software group Craneware and Berwickshire-based potatoes marketer Produce Investments Craneware was a more obvious choice with the share price nudging new peaks after recent results demonstrated its abilities to fatten margins in its dominant US market ahead of new product launches.

In contrast, Produce Investments has seen its shares price tumble after suffering the effects of a potato glut and supermarket pricing wars but has lifted its already-generous dividend in anticipation of better times ahead following its recent purchase of the Jersey Royals business.

We have set our usual stop loss target, some 10% below the current share price, at which we advise followers to consider selling on any major reversal.

Most of our existing tips slipped back in line with the general market last week with three of our four portfolios recording losses when we carried out our mid-week review of progress.

The 2014 list was the one exception with its valuation rebounding 2.2% following good performances from more recent recommendations Experian and Carr's together with fresh support for the Ricardo engineering group after a strategic acquisition.

But the 2012 portfolio was down an identical 2.2% after sharp falls in FTSE 100 members Carnival and Kingfisher and the 2015 selections gave up 1.7% as FirstGroup shed its recent gains on vague takeover speculation.

The 2014 portfolio recorded a fractional overall slippage with Lloyds Banking the main casualty as a result of Tory plans for a discounted sale of shares to the public.