Just having a look at who's starting 12 in the Prem this season (stat.s from all.rugby).
Bath:
Redpath has starting 8 games at IC - He is, of course, Scottish.
Ojomoh has only started 2 games at IC (+10 in a different shirt) - Mostly playing alongside Redpath, and when that happens, they tend to play as numberless centres.
Bristol:
JVR has started 11 matches at IC (+4 in a different shirt) - He is, of course, Saffer.
No real 2nd choice.
Exeter:
Hawkins has 10 starts at IC (+5 in a different shirt) - He is, of course, Welsh.
Devoto has 4 starts at IC (+3 in a different shirt) - He is also >30 now.
Gloucester:
S.Atkinson has 10 starts at IC (+5 in a different shirt) - But he's playing poorly in a poor side.
2nd choice is split between M.Atkinson and Llewellyn - The former is 33 now, the latter is Welsh.
Harlequins:
Esterhuizen has 8 starts at IC (+1 in a different shirt) - He is, of course, Saffer.
2nd choice is split between Anyanwu and Northmore.
Leicester:
Kelly has 9 starts at IC (+6 in a different shirt) - But he's playing... not great, and seems to have been moved out to OC to accommodate Kata (but still 75%+ an IC).
Kata has 6 starts at IC (+3 in a different shirt) - He is, of course, Tongan.
Newcastle:
Orlando has 7 starts at IC (+9 in a different shirt) - He is, of course, Argentine.
2nd choice is split between Hutchison and Holgate - Scottish and Saffer.
Northampton:
Hutchinson has 9 starts at IC (+2 in a different shirt) - ETA: Also, he's still Scottish
Dingwall had 4 starts at IC (+8 in a different shirt)
Sale:
Bedlow has 12 starts at IC (+1 in a different shirt)
Tuilagi has 2 starts at IC - and is injured again.
Saracens:
Thompkins has 9 starts at IC (+2 in a different shirt) - He is, of course, Welsh.
Hartley has 9 starts at IC (+6 in a different shirt) - It is, IMO, too soon for him, needs a chance to not/suffer from second season syndrome.
This leaves us the choices of:
Ojomoh - Playing more at 13 this season, but is still mostly a 12, but becoming "numberless"
Devoto - Aged 30 and plagued by injury
S.Atkinson - Suffering second season syndrome
Kelly - Not playing great
Hutchinson - Is he really good enough? Or English enough?
Dingwall - Has risen from about 1/4 of his gametime at IC to about 1/3 - I still see him as an OC playing 12, but he's got more time there than a Slade or Lawrence
Bedlow - Is he really good enough?
Hartley - This is the first season he's played more than 10 matches.
Ojomoh and Dingwall have the advantage of potential club combinations with an OC. In which case, Ojomoh/Lawrence is ahead of Dingwall/Freeman; on the principal of Lawrence being in possession of an England shirt, and not being a completely novice pairing (yes, I know Freeman has a couple of caps in the back 3).