Hi Rob - Welcome to the forum
I would like to say to get pedal X, or pedal Y and that will be what you are after, but ultimately, it will be a case of you just trying out a few pedals yourself. - The thing is that it's not strictly a case that there is one pedal on the market that you can plug in & it will give you exactly what you need. You will probably need one pedal to give you a bit of reverb/delay, and another to give you your bluesy crunch.
Mind you, before you think about whether to invest in a pedal, you should ask yourself if you really need one. Take a good look at your amp. Maybe your amp is capable of doing the job perfectly well if you tweak a few settings. Maybe trying out different pickup switch positions on the guitar, or rolling the tone pot may give you a better tone. Those are things you can do for free, and already get a huge range of tones.
Another possibility is to maybe consider a multi-FX unit. There are some very good ones out there for all budgets. Getting one of those will allow you to experiment with a whole range of sounds and tones. You may find exactly what you're looking for, or you may come across something new. However, it can be a bit overwhelming, and sometimes, it's difficult to focus on getting your own tone.
If you still want to get an effects pedal, my personal recommendation is to look for a decent Overdrive pedal for the blues crunch, and maybe a delay pedal for the reverb (Your amp should be able to provide a little reverb already, but a delay pedal with low settings can make the reverb sound more natural, in my opinion)
Finally, and this is important - Aiming for a tone based on a tone you hear in a song is always good. Trying to replicate that tone perfectly is always not good. Get a tone that sounds right & good to you, and don't be dissatisfied if it doesn't sound exactly like Chris Rea's. If it sounds good to you, and feels good to you, then don't mes with it.
