http://www.caa.co.uk/docs/33/CAA_CAP%20804.pdf
For Type Rating under CAP804
FCL.740 Validity and renewal of class and type ratings
(a) The period of validity of class and type ratings shall be 1 year,
The only ways to continue exercising the type rating beyond 1 year are
FCL.740 (b) Renewal or FCL.740.A Revalidation. No exceptions in the UK.
If you are not planning on flying with EASA carrier you won't need a type rating in your license. EASA license does not expire.
If you still hold an UK/JAA license here are instructions how to convert.
Converting UK and JAA Licences and Ratings to Part FCL | Commercial Pilots | Personal Licences and Training
For the instrument rating under CAP804
FCL.625 IR(A) – Validity, revalidation and renewal
(a) Validity. An IR(A) shall be valid for 1 year.
(b) Revalidation
(c) Renewal.
(d) If the IR(A) has not been revalidated or renewed within the preceding 7 years, the holder will be required to pass again the IR theoretical knowledge examination and skill test.
*The UK CAA has issued an exemption against FCL.625(d) (see paragraph 5.3)
5.3 FCL.625(d): IR Renewal requirement for pilots who hold or have held an IR on
another licence or a UK Military Green Rating
The UK CAA has issued an exemption such that where a pilot holds or has held an
Instrument Rating issued by a third country and that rating is compliant with Annex I to
the Convention on International Civil Aviation, the applicability of FCL.625 IR(c) and (d)
may be based on the validity dates of the Instrument Rating of that other country. The
effect of this exemption is that to renew the IR on a UK issued licence:
(i) a pilot with a current and valid 3rd country IR shall complete the revalidation
requirements of FCL.625(b) and the aircraft category specific requirements for
revalidation of the Part-FCL IR; meaning that he must pass the proficiency check,
but is not required to undergo training or to re-take the theoretical knowledge
examinations; or
(ii) a pilot who held a 3rd country IR that is no longer valid but had been revalidated
or renewed within the preceding 7 years shall comply with the renewal
requirements of FCL.625 IR(c), but is not required to re-take the theoretical
knowledge examinations.