Use of Home as office tax deduction - claimed on different business by same person

A self employed Trainer who does all admin work and preparations at home and delivers training in different locations includes a cost for "use of home as office" in tax deductible expenses ( at £2 per week). If he now ventures into property letting, is he allowed to claim £2/wk for admin work from home relating to his property business seperate from that chargd for working as a trainer ? or is he just allowed £2/wk regardless?

thanks in advance