Welcome to the forum Hazel.
As others have said, used will always give you better value. You may also want to consider the type of birding you do to inform your choice - for example, if you walk a lot and bird within a variety of habitats a smaller 50-60mm scope may be best, if most of your birding is at a large waterbody or on the coast, a larger 70 - 80mm scope will allow for higher magnifications to be used.
It is also worth considering whether an angled or straight scope is best, angled are more popular and arguably more flexible, but if you only bird from a hide or car, a straight scope would probably be a better option.
£200 is a significant outlay for many, but not a huge budget for a scope sadly; in terms of a new scope, you could consider a package such as
this little Viking scope, which would comfortably be in budget, but I have no experience with this scope and don't know how it performs.
If you are happy with secondhand,
this old Kowa for £99 would be a good buy, and if you called Cley Spy directly, I'm sure they'd do you a deal with a decent tripod (Velbon Sherpa or similar).
If you could push your budget a bit,
this Opticron would also be an excellent buy, particularly as it used ED glass - higher quality for a clearer, brighter image. Opticron also have good customer support and their products are generally excellent value for money. Pair the latter with
something like this, and for £245 you'd have an excellent set up that will last a while - you can add another eyepiece later if you want.
Hope this helps, and good luck!