A reminder to run your air con occasionally through the winter months as it keeps the seals etc lubricated. Use it or lose it!
It does appear to me that the Peugeot air con is particularly good at holding its pressure so if it stops working well, it is worth while getting a top-up - £35 is quite a reasonable rate for what is involved.
See this page for a good explanation of pressures to be expected in a car air conditioning system.
On a hot day, my yellow car was measured (PP2000) at 14 bar (200psi) which is within the range (and is working well)