Welcome to the forum, you'll sure discover lots of help and good advice.
I am no optics expert (and that is one reason my view could be of interest
), but I'd say the most important thing before asking for a brand or model is to ask yourself the usual questions what, where, how, etc. There are endless webs with recommendations for choosing binoculars, here are 4 simple ideas for you to think about.
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Where. I know you're looking for an allroundeer binocular, but where will you be using them most likely: marshes (for example, because that's what you get where you live), forests with thick vegetation (this could point you to higher or lower magnification, 6x, 7x, 8x, 10x, etc.) 8x seems to be a nice balance (easy to handhold, stable), but don't underestimate "the power" of 7x (brighter, more stable, greater depth of field). 10x is less desirable in forest situations for the smaller field of view, or if you have shaky hands, and they find their spot if your looking at distant birds (say coastal birds, marshes, etc.).
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How will you be using your binoculars: will you just drive with your car to a RSPB reserve (so you don't mind a bulky/heavy item) or will you most likely do your birdwatching bit while on long treks (low weight is essential). This could be a crucial point to determine the objective size (30, 32, 35, 42) and hence the size and weight. As an example, my first "good" pair of binoculars were a really astonishing 8x42... which I ended up selling because of the bulk and weight. My perfect compromise is 8x32 (or 30 for that matter) because I do most of my birdwatching while on treks. Also, do you plan on using the very early or quite into dusk (this could imply the need of a bigger lens, 42-50), but most people who do casual birdwatching do not like to wake up at 5 AM to catch that very wary little bird. So I'd say x32 is a really good compromise for daylight birding (I know, I know the UK can be pretty gloomy at times).
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Which type of binoculars, porro/roof. Don't know if you've considered this, but on the £100 mark there could be some brilliant porro choices that would outperform its roof rivals, although sometimes being a bit bulkier.
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Used/new. If there is one good piece of advice I would have like to been given some time ago is: don't forget (good-reliable) used binoculars. For £150 you can get a really nice used piece of equipment. The classified area of this forum is not the worst point to start looking for good stuff
I hope these little pointers can help you make up your mind.
As for actual recommendations:
I love my Kowa 8x30 YF. Very light and handy waterproof porros, the clarity and 3D plasticity is something to behold. And they can be had for very little money, even less than your estimate.
(The Bushnell Nature View 10x42 can be found new on ebay for little over £100)
