knocking on switching engine on/off

[drahcir74]

Hello, wonder if anybody can help, i got my 2.0l desire 05 reg in November last year and its been absolutely brilliant, its only got 36k on the clokck and generally runs really well.

the problem being over the last week or so it has started to knock on starting up or switching of, not everytime but most. when i looked online somewhere suggested the engine cover and i've checked and it does seem that the cover is loose.

however this evening it was worse so i watched with the bonnet open whilst my daughter switched off the engine and there seemed to be a lot more movement than i'd expect.

i'm admittedly not very good with engines etc.

i got three months warranty with the car which i bought from a garage quite a distance from home. the warranty runs out this sunday. does anybody have any thoughts as to

a) what is causing this
b) is it likely to get worse

i'm off work tomorrow and considering taking it to the garage.

thanks in advance.