When you're going to be spending upwards of £1000+ on an amp, and several hundred on a guitar, I think £40 to go and try a load is a no-brainer, to be honest.
As someone else said- you're going to have to either pay for shipping or pay to go and collect it anyway, so when you're ready (i.e. when you have the money) then you can go and test loads, and buy at the same time.
I know what it feels like to fantasise about getting amazing gear NOW, but as everyone is saying, it pays to be patient, take your time, and try FIRST HAND all the gear you are considering.
"Does it have a good vintage sound" is extremely subjective, and what someone here describes as great vintage tone might sound disgusting to your ears.
Basically, without meaning to be too harsh, only you know the sound you want, and that's why there is no substitute for listening to the amps yourself.
ANYWAY- if I wanted a vintage overdrive, neither ENGL or Mesa would be on my shortlist. If I wanted modern metal, they would be at the top. You need to prioirtise what sound you really want I think.
Hope some of that makes sense! :)