The portfolio is built up by a new selection in a new sector each month. Occasionally that new selection may consist of two shares in the same sector – which I term Multiple Choice – if I feel that this suits the portfolio under construction. There is a minimum of 15 sectors and usually no more than 20 in a portfolio though the upper limit is not fixed. Thus it will normally take 15-20 months to complete the construction.
I picked both RDSB and BP. as my oil sector MC for HYP7 so as you are catching up and following this latest portfolio, you should own both. Note that where I suggest MC for a sector, you must split your unit sector investment equally between them so as not to overweight it. So if for example you are catching up with an investment of £5,000 per sector, then you should put £2,500 in each of RDSB and BP. so that the total invested in oils is still £5,000, same as the other sectors.
Hope this helps but please ask if you have any futher queries.