Detailed maps of the St Thomas' Hospital Site (including the Evelina Children's Hospital) and Guy's Hospital are available at:
http://www.guysandstthomas.nhs.uk/resources/location-maps/st-thomas-map.pdf
http://www.guysandstthomas.nhs.uk/resources/location-maps/guys-map.pdf
A detailed map of Parkside Hospital, Wimbledon is available at:
The Portland Hospital is near Regent’s Park and is easily reached by public transport. Please click here for the hospital’s maps and directions.
Parking advice: if you plan to come to the Portland Hospital by car, please be aware that the hospital itself is just within the TFL congestion charge (£15) and ULEZ charge (£12.50) zones https://tfl.gov.uk/modes/driving/congestion-charge/congestion-charge-zone. However, the A501 (Marylebone Road) which runs East to West and the roads North of this are outside the congestion zone, along with public roads where parking may be available, subject to demand.
Public car parks just to the North (in the Albany Street and Longford Street areas) are small and usually fill up very early in the day. Some options include Lomax carparks North of Marylebone Road http://www.lomaxcarpark.co.uk/bucklebury_house.html
However, there is Pay and Display parking (£2.40/ hour, subject to demand) at the South end of the Outer Circle of Regent’s Park (orange arrow), which is a 6 minute walk along the edge of Regent’s Park to the Portland Hospital (green arrow).