Thanks for the replies and the link Max. I can't understand how I missed that thread when I was searching.
I do already have a stirrup pump but it was a visit to Poole over the last few days that did it for me. I have the boat inflated in the garage so I had to deflate it. Then inflate it again for a few hours use, deflate it for travel home then inflate again ready for use in the garage. By the time I had done this I was going off manual pumps!
However I have learned that I have Halkey Roberts valves. Why is it boaty things always have funny names?
Someone should do a numpties glossary for all the odd names everybody bandies about when they know what they are doing!