If you are looking to work in the UK, a Forensic Science undergrad degree is a highly questionable choice. If you are looking to be employed directly by the police - as in you want to work as a Scene of Crime Officer actually collecting exhibits at the scene or working directly on them - then the training will normally be delivered to National Standard by the force you are employed by and a Forensic Science degree forms no part of your recruiting process. The route in is often that you apply to be a junior SOCO and working as a fingerprint examiner. You can then progress to all the other things.
If you are looking to work for a secondary employer in the field (i.e. not the Police) then you are much better off with a straight up sciences degree of almost any flavour, be it Chemistry, Biochemistry, Natural Sciences, Physics, Maths, whatever. You will also have better exit routes or alternatives.
The only thing different you will get from a Forensic Science degree is a bit of dressing up and a few talks from practitioners - and this comes at the cost of losing a "pure" sciences degree in favour of something a little bit weak and a little bit wishy-washy.