I can vouch for what smithandroper said. Replaced both sides on my 200 a few weeks ago. I had to re-stick one of mine because I didn't spend enough time cleaning the residue of the old one off. I ended up using an old Blockbuster membership card (like a credit card), and some very hot water. Probably got about 95% of the residue off the second time round and it worked a charm.
It's a really simple job, just takes time to clean the olds ones off. Don't take shortcuts though, otherwise new one won't stick. And yes, it's very common. £16 each posted sounds about right.