Seems my Pro Alloy FMIC Group Buy is still popular
! Only a week to go mind
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You could think about a race cat instead of the decat pipe. Milltek produce one which would fit straight onto their catback system, and it certainly improves the engine breathing and adds a nice low rumble to the exhaust note. It's legal too, and won't need to be changed at every MoT, but don't look too closely at the size of the bill
!!
A GTEC1 chip should be fine with your mods, and is a very cheap way to get an extra 20 bhp. If you are concerned about the fuelling, get the car to a RR and check it out, as this is still a relatively cheap option.
What about a PRV? Again, for £22-25 you get a simple boost controlling device that gives a good level of protection. Alternatively, consider an electronic boost controller
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Phil