Jim W wrote:

Hi can anyone suggest a good rose cultivar as a wedding gift for the
following situation.

To grow in a container on a balcony, (2nd or third floor) in Bristol UK

So the balcony has a southern exposure? I'd give my eye teeth to have
Harkness roses...how about Calliope:

http://www.roses.co.uk/rose/flori/calliope.htm

or Great Expectations (through Cocker on this website)
http://www.roses.uk.com/rosedet.cfm?roseid=345

Or The Lady, which was beautiful at St. Albans.

Or how about a Cocker rose, Heart of Gold:

http://www.roses.uk.com/rosedet2.cfm?roseid=473

Are you going to supply the pot? It sometimes costs more than the rose.
Get a large one - 15 gallon minimum.

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Cass
USDA Zone 9 Left Coast
www.rosefog.us