I might have answered my own question but please feel free to agree or disagree !
Given that the main condition for relief is:
(2) The first condition is that on the chargeable day the ratepayer –
(a) occupies only one hereditament in England;
SI 3315/2004 The Non-Domestic Rating (Small Business Rate Relief) (England) Order 2004
If the key word is “occupies” would the fact that in the case of partnerships, the partners are joint occupiers of the whole and every part of the building and each partner is liable for the rates on the whole, mean that both businesses are excluded from SBR on the basis that the person occupies more than one hereditament ? (LGFA 1988 s50(1) and SI 145/1990 reg 3, 4 and 5).
any views ?