306 not going into 5th gear?

[Pipsqueakaboo]

Hi guys! 

Last night I went out for a drive with my mum and we went on the a27,

I went to change into 5th gear and it wouldn't go in.

I tried about 5/6 times but it just made a whirring sound like screeching (not high pitched though - the noise it makes when you need to change up a gear) but it wasn't in 3rd, then there was a burning smell so I went back into 4th until I got off the 27.

I have no idea why it was doing it.

but a couple of weeks ago the car was making this loud vibrating humming sound/feeling - like when you drive on the white line on side of the road. but I was doing 30/40mph.

its just weird and probably nothing, but wanted to find out if anyone knew what it was/had similar exp with it.

Taa love Charley