Have seen many transfers- but none to SMP- most people are clamouring to get out and into a group that makes money! You need the partners of the team you want to join to support you and it is both practise heads who have sign off- so if its what you want to do, talk to your line managers so they know what is going on, then take your current head to coffee and tell him why you want to leave, get his support- then take Mark for coffee and persuade him he wants you in the team. If you have a valid reason and something to offer,you should be fine