Going around from 1770ft indeed involves a descent at or above the glideslope down to 700ft to adhere to the published missed approach procedure. Same stuff at London City, approach starts at 3000ft and missed approach altitude is 2000ft, so again, descent if above.
Particularly tricky situations to develop as why you go-around from that altitude. Think of windshear, technical malfunctions etc. many possibilities which may prevent you from descending to 700ft and making those 185kts in the turn. Thorough briefing required for these kind of procedures, accompanied with some serious T&E management.
Easiest solution would be to contact ATC and tell them your intentions in situations like that, they're there to help you!