start getting quotes from the builders as it will take you 6 months to get one to a, commit to
a) actually turn up to have a look at the job,
b) be bothered to submit you a quote if they have bothered to carry out (a)
c) take approx 4-8 weeks to get you a quote if they have gone to the (a)&(b)
d) for you to laugh at the variation in price - will ad another 4 week to try and justify the differance in quotes.

then you can start with getting the architect to follow the same steps above.

then the council to charge there farsical fees for fook all.

if your thinking of starting to build then you have a 3-4 month window of preparation to go through, approc £2k in fees before you even dig a hole to start