Plant the hydrangea into the garden in autumn. As for the geranium, depends what you mean by geranium - true Geraniums are native British plants and are herbaceous perennials - what most people call geraniums, however, are pelargoniums, sold during summer, as bedding plants. These need to be brought indoors or somewhere frost free for winter.

I agree with Bamboo on the geranium part of the question. However if the hydrangea is in a pot then as long as the hole you are putting it into is well dug and there is plenty of loose soil around it then I see no reason why you cant plant it out when ever you want. It is just like buying a potted specimen from the gc. The only draw back and I suspect this is why Bamboo suggested autumn, is you will have to watch the watering. Especially in a dry spell, it will need a lot.

Yep, that's exactly why, Seaburngirl - I don't know where Kathday is in the UK, she hasn't said, so for all I know she's in an area with a drought order in place. Not that it matters at this precise moment, she'd be lucky to get out there long enough to plant anything in between the downpours currently.