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Thanks for your replies! Jenna - you always give long (in a good way!) and very helpful answers!
Because I only want to wear them occasionally, I have been given daily disposables to try.
I had them on for about an hour in town earlier before going back to Specsavers. He then checked my eyes and vision again whilst they were in. I did say that they were a bit blurry, but he didn't seem to comment on it really.
My eyes are +4.25 in my left eye, and +4.00 in my right. I also have slight astigmatism in just my left eye. I have been given contacts of +4.00 for both eyes, as the optician says this should be fine for the type of use I want them for. He did mention that normal contacts like these won't correct the astigmatism, and said that it wouldn't really be worth paying double the price for ones that did as it wouldn't make much difference.
Will see how these go, but I won't be surprised if I need to try different ones if I'm going to persevere.