The council position
All long-stay car parks allow motorhomes to park during the day. If a vehicle goes into another bay then they will need to obtain a ticket for as many additional bays as are taken. At the Swimming Pool Car Park the 8m bays will not be specifically for the use of motorhomes due to licensing and planning restrictions though it is expected that motorhomes would most benefit from this area.
This idea that licencing and planning is needed is a bit of a red herring. The Caravan Sites and Control of Development Act 1960 allows local authorities to provide facilities. It is so called legal experts in the authorities that interpret the act in a different manner to which it was written.
Provision of caravan sites by local authorities
24.—(1) A local authority shall have power within their
area to provide sites where caravans may be brought, whether
for caravans, for holidays or other temporary purposes or for use as permanent
residences, and to manage the sites or lease them to
some other person.
(2) Subject to the provisions of this section, a local authority
shall have power to do anything appearing to them desirable in
connection with the provision of such sites, and in particular—
(a) to acquire land which is in use as a caravan site, or which
has been laid out as a caravan site, or
(b) to provide for the use of those occupying caravan sites
any services or facilities for their health or convenience;
and in exercising their powers under this section the local authority
shall have regard to any standards which may have been
specified by the Minister under subsection (6) of section five of
this Act.
(3) The local authority shall make in respect of the use of sites
managed by them, and of any services or facilities provided or
made available under this section, such reasonable charges as
they may determine.
(4) A local authority may make available the services and i
facilities provided under this section for those who do not
normally reside in the area of the local authority as freely as for
those who do.
(5) A local authority shall, in the performance of their functions
under this section, have power, where it appears to them
that a caravan site or an additional caravan site is needed in
their area, or that land which is in use as a caravan site should
in the interests of the users of caravans be taken over by the
local authority, to acquire land, or any interest in land,
compulsorily.
(6) The power of a local authority under the last foregoing
subsection to acquire land, or any interest in land, compulsorily
shall be exercisable in any particular case on their being
authorised to do so by the Minister, and the Acquisition of Land
(Authorisation Procedure) Act, 1946, shall have effect in relation
to the acquisition of land, or any interest in land, under the
said subsection as if this Act had been in force immediately
before the commencement of that Act.
(7) A local authority shall not have power under this section
to provide caravans.
(8) In this section the expression "local authority" includes
the council of a county and a joint planning board constituted
under section four of the Act of 1947 for an area which consists
of or includes a National Park as defined by subsection (3) of
section five of the National Parks and Access to the Countryside
Act, 1949, or any part of such a National Park.
(9) This section extends to the administrative county of
London and the expression "local authority" in this section
as so extended includes the council of a metropolitan borough
Sites occupied by licensing authority
11. A site licence shall not be required for the use as a caravan
site of land occupied by the local authority in whose area the
land is situated.
. Flyde council did talk about a drain and water tap as it would also benefit the beach huts but like you say the ground works are very expensive. The council are doing a very good job with this stopover in the last year they have made larger bays for motorhomes and have now put 3 extra bins behind the bays they have also got a new tariff if you want to stay the day and night. I just hope all there hard work is not ruined by a few as its a good example to show other councils that the idea works. 
