Thank you all for your help.
Yes! I am reluctant to cut the bulkhead and also after further reading it would appear the Metro Turbo kit I have is probably very "yesterday" as most turbos being recommended for the mini are the "T2" range.
I am not after big power figures but on the other hand I do not want to go down the Turbo path to only achieve figures of a well modified normally asperated engine.
I have looked at the Turbo minis web site and a few other UK Turbo sites and the majority are indicating good results from the T25, plus the manifold from Mirage looks a bit more professional than the clunky setup of the Standard Metro Turbo. and I would not have to take big chunks out of the firewall and bulkhead.
I guess its a case of watch this space?

I may have a T3 turbo for sale?
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1969 Cooper "S"
1967 Mini Deluxe
1973 Clubman Van (the fleet spare)
1978 ex 1275 LS ("Wizard" Eaton Supercharged)

2015 HSV GenF GTS(occasional drive & tow car)
2019 MINI F55 Cooper S